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Questions tagged [sim]

A SIM card is a card in a GSM cell phone that tells the network about the phone, e.g. for authorization.

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Smart Card (SIM Card), connect to stm32 via USART

After get ATR and send PTS, I tried send APDU, but response always the same as APDU which has been sent. I tried to change the frequency for USART (clock) and baud rate, after I tried to change PTS ...
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Voltage/current issue in a circuit

I am working on a project where I have a 3.7 V battery connected to a SIM module. The battery has a maximum voltage of 4.2V and a cutoff voltage of 2.65 V. A NodeMCU is also connected to the circuit ...
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SIM7080G MFF2 SIM not detected

I have designed and assembled a custom PCB with ESP32 and SIM7080G LTE-M modem, basically an IoT weather station. SIM7080G datasheet Everything works fine except for a very important part that renders ...
Reicken Back's user avatar
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Dual SIM and eSIM design

I want to have both nano-SIM socket and eSIM (MFF2) to a nRF9160. Since they both will be parallel, I was thinking to break eSIM power (VCC pin 8 of MFF2), when a physical SIM is inserted using the ...
okwestern's user avatar
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SIM808 module does not get GPS location

I am trying to use a SIM808 module to get a GPS location, but it does not work. My power supply can provide up to 5A. The picture results from my communication with the SIM module using the AT command....
trungvann's user avatar
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Different GPS antennas not working properly on my GPS module

I have a SIM808 based board. It is working fine with an antenna similar to this: enter image description here Now I want a smaller one; I bought 3 from Amazon for testing. The same voltage, frequency ...
Cherif Dekari's user avatar
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GSM Operator Register problem (CREG:3 Error)

I am using Turkcell operator (2G) in my application (28601). GSM Modem: Telit / GE910QUAD. I use the AT sequence listed below: ...
Mehmet Günce Akkoyun's user avatar
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Data logging on a SIM5320

One of my SIM5320 devices is using a lot more data than before while sending a POST message to a web server. I like to see what connections the SIM5320 is establishing, but i don't know how. What is ...
Patrick_iot's user avatar
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SIM808 emits random numbers

I am programing a Maduino M0 board with a SIM808 GSM/GPRS/GPS module on it using the Arduino IDE. Periodically, after reprogramming the board a few times, the SIM808 no longer responds to any serial ...
SharpCarel's user avatar
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75 views

Is it possible to transfer provider from one SIM card to another? [closed]

Is it possible to overwrite (migrate) provider info and details from one SIM card into another SIM card (not blank, but another working SIM card), so, when I insert that new card, the phone could ...
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Difference of Milenage Version 1 and Version 2

I've heard in the telecom industry about Milenage Version 1 algorithm and Milenage Version 2 algorithm. I want to know what are their differences? The version 1 and version 2 have the same length for ...
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How is eSIM attached to carrier?

I am developing IoT device which has integrated SIM7080G. I would like to know if I rather should go with basic SIM or use new eSIM ICs like ST4SI2M0020TPIFW. What's wondering me is when I buy eSIM IC ...
user1085907's user avatar
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A6 SIM module keeps resetting

I'm using a SIM A6 module (Goouuu Tech A6, I believe it's the same) to send messages. The problem is, once I plug in a SIM card, it keeps resetting (the green led blinks and kind of interrupts after 3-...
Bogdan Bogdan's user avatar
2 votes
1 answer
2k views

Assisted GPS (AGPS) on SIM7600 module does not work

I recently got a SIM7600G breakout board and wanted to use it with the CGPS functionality for A-GPS. It works with connecting with my SIM to the Internet and all, but when I try to use AT+CGPS=1,3 (UE-...
user1995565's user avatar
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Is there something wrong with this SIM card circuit

I have been troubleshooting a SIM card circuit for a few days now but cannot get it to work. The purpose of this circuit is to connect a quectel bg95 to a sim card so that I can connect to my cellular ...
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Would it be possible to use a GSM without a SIM card?

I would like to reduce the footprint of my PCB (a simple IOT GSM impl.). Given a common GSM such as SIM800/868/900l etc. Would it be possible to completely replace the footprint of a SIM card holder (...
Axiom Lemma's user avatar
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How can I program my mcu stm32f103 to transmit and receive data via a server [closed]

hello I am a beginner and my final project is an alarm system, in fact I use a mcu stm32f103 and I want to transmit the data by a GSM module to a base (to access it by a mobile application) and also ...
ss_yh's user avatar
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Putty won't allow me to type. Can only type the letter 'A'

I connected a SIM7605CE module to the PC (Image shown below). I downloaded and installed all the necessary firmware for the device. I connected the device to a 5V DC power supply and connected it to ...
C Vith's user avatar
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Are there regional constraints with the SIMCom modules? (Eg. SIM7605CE/SIM7600CE)

I recently received a SIMCom Module (Model no. SIM7605CE), shown below. The item can be (purchased online as well). The device, much like the ones used with Arduinos (like the SIM800L), is supposed ...
C Vith's user avatar
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Do the contacts on a SIM card and card holder always match?

I am trying to choose an SMD SIM card holder for my PCB but while doing so noticed a few inconsistencies for the C1-C8 locations on a product's footprint. It has got me wondering if all SIM cards and ...
Feynman137's user avatar
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How can I let 2 devices take turns accessing a SIM card?

I need to store data in a sim card using one device, then another device needs to access that data. They do not ever need to use it at the same time. A question was asked about this a few years ago ...
DallaThaun's user avatar
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How do I prepare my SIM card for SIM800L GPRS GSM module?

Im trying to send a SMS message using the SIM800L GPRS GSM module. I know this might sound stupid but, do I need to load my SIM first before it can send SMS message? If possible, can I just pay after ...
Satou Kazuma's user avatar
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Why RXD text are uncomplete in atmega328 intrupt driven USART?

I have an Atmega328p MCU which is connected to USB port by ch340 chip and I've connected it to GSM module by hardware RX/TX/GND pins. I don't send any command to USB port all commands are send by ...
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Why does the Atmega328 USART get trapped in a loop?

I have an Atmega328 micrprocessor. I connected its RX/TX pins to an SIM808 module and uploaded this code to the processor to communicate with it and send commands: ...
malloc's user avatar
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SIM 800L, I lose signal (+CSQ=0,0) once I insert the SIM card

I have a GSM/GPRS module, SIM800L, and I am facing network difficulties with it. If the SIM card is not inserted, the antenna connects perfectly to the network with ...
Imene El EUCH's user avatar
1 vote
1 answer
1k views

What is an epad in SIM MFF2 layout

I found a Kicad model for SIM MFF2 on the web that I wanted to use in my project but I don't know what is EPAD pin and how to connect. EPAD is this central biggest pad on the right image. Does anyone ...
pbn's user avatar
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303 views

SIM800L GND pins

I want to create a PCB design for this . In datasheet of SIM800L i found it has many ground pins. datasheet recommend this : My first question : is just using 2 , 43 , 44 and 45 pins enough and i ...
yeganehhp's user avatar
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GSM SIM800C not responding

I'm using Arduino IDE software Arduino Uno board GSM SIM800C BSNL 4g SIM card Interfacing RX (of GSM) to PIN 2 (of Arduino) TX (of GSM) to PIN 3 (of Arduino) GND to GND Power supply For Arduino - ...
Kavya's user avatar
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SIM800L microphone problem

I want to feed SIM800L a microphone signal. I found this page in the datasheet and it worked but I need more a sensitive microphone. I want to hear voices in room as much as possible, like a spy bug. ...
yeganehhp's user avatar
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2 answers
533 views

SIM800L rarely responds to commands

I'm trying to get a SIM800L module working with a USB-to-serial adapter using this circuit: simulate this circuit – Schematic created using CircuitLab (All of those resistors are 1000 ohm.) I ...
Aaron Christiansen's user avatar
1 vote
1 answer
138 views

Sim Card extender Circuit

I am looking for suggestions to solve a Sim card problem. In my system I have a microcotroller interfaced to an Lte mode and this resides in an outdoor elevated position. I would like to put the Sim ...
Eoin O Connell's user avatar
3 votes
1 answer
2k views

SIM800 doesn't give GSM location

I have problem to get exact GSM location using SIM800L. I have followed instructions in the manual. But my module just gived me latitude = 0 and longitude = 0. This is what I do with my serial ...
SkyFrotza's user avatar
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208 views

SIM868 breakout board does not accept GNSS/GPS AT commands

I bought SIM868 breakout board with GNSS support. https://www.aliexpress.com/item/33013782111.html However, I can’t get coordinates using standard at-command AT+CGNSPWR=1, AT+CGNSTST=1, etc. I get “+...
zhekaus's user avatar
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How to cut a nano SIM out of a 8-pin SIM? [closed]

I have a 8-pin SIM, which I want to cut into a nano SIM (which only has 6 pins). Looking at the Wikipedia X-Ray image, I assume I should cut the lower 2 pins. Is this correct?
Markus's user avatar
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Molex 5039600695: What is the SIM card stopper referring to?

On some SIM card holder datasheets, I've seen references to a card stopper feature that prevents users from inserting a SIM card incorrectly. This card stopper appears to be a mechanical feature built ...
Chris Fernandez's user avatar
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533 views

SIM800: AT-command to get connected sender ids

I want to roughly estimate where my Arduino currently is. For this, I want to fetch the identification numbers of the stations it is currently connected to, so I can put them into an API which then ...
Cowboy_Patrick's user avatar
3 votes
1 answer
1k views

How does a cellular network deal with a duplicate SIM? [closed]

I was pointed here from WorldBuilding. Say I had a cellphone, let's call it cellphone A, and made a perfect copy of it - SIM card and all - and let's call this one cellphone B. If I were to call ...
zeph's user avatar
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How does GSM Module store incoming SMS in its "SM" or "ME" memory?

I am using AI Thinker A7 GSM/GPRS/GPS Module demo v7.1.(The Rx, TX, GND pins of this module are connected to tx, rx, gnd pins of the prolific Rs232-TTL converter and a virtual com port is open in ...
BetaEngineer's user avatar
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1 answer
148 views

SIM to RJ: emulating SIM card as a RJ connector [closed]

i recently got in a Goodwill store one of the 2500 model phones https://en.wikipedia.org/wiki/Model_500_telephone#Model_2500 and i want to use it. the problem is that i don't have a phone line in my ...
The Shwarma's user avatar
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1 answer
7k views

What could be done with a deactivated SIM card?

I was reading https://reverseengineering.stackexchange.com/questions/15011/how-does-a-sim-card-work and from that, I can say that, really really simply put, a SIM card is sort of an extra memory that ...
snorlax's user avatar
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SIM800C - CME ERROR: 15 SIM wrong & CME ERROR: 10 SIM not inserted

I am making a GSM Tracker with SIM800C module. After deploying it into vehicles.. It works fine.. but after some days, it starts responding as CME ERROR: 15 SIM wrong for command AT+CPIN? & CME ...
bandejiya's user avatar
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4 votes
1 answer
682 views

M2M vs normal SIM cards

I recently bought some global 3G modules from Digi International and wanted to test one of them with the SIM card from my phone. I was surprised when I saw the module couldn't connect to the network....
Andres's user avatar
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SIM800L restart automatically

I know there is a similar question but it did not solve my doubts, I will be clear and concise. I recently bought the SIM800L module and then I started to try it, at the beginning it restarted itself ...
imTDB's user avatar
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1 answer
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Connect SIM5360 AWS server GET / POST calls

I have a SIM5360 module, with a Vodafone card, and I would like to connect to some web services, to send and receive data in JSON format, which I have implemented on an AWS server. To execute the AT ...
Celia Montes Schumann's user avatar
1 vote
1 answer
425 views

smart card clocking using NXP

In my current project, I'm trying to implement a smart card reader using LPC1788 which has a built-in smart card interface. Smart cards use the ISO7816-3 standard to communicate with the outside world....
Alireza 's user avatar
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1 answer
152 views

Power consumption of TDA8029 USIM controller for 3V/5V cards

we are using TDA8029 in one of our application board. Just a summary of the circuit. TDA8029 in our board connects a USIM card and reads the data and sends on UART. In our board, 2 supply inputs of ...
user19579's user avatar
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1 vote
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SIM7100 GSM Modem Unreliable Connection

I am trying to communicate with SIM7100 GSM modem but I could just rarely communicate with it across UART interface. I am observing the signal with an oscilloscope, I am giving 5V as High and 0V as ...
onrep's user avatar
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3 votes
1 answer
484 views

Save data on sim card using micro-controller

SIM cards come in various data capacities, from 8 KB to at least 256 KB. All allow a maximum of 250 contacts to be stored on the SIM, Is it possible to save data (other then contacts) in sim card, ...
Jon's user avatar
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2 votes
2 answers
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I only hear quzz when making a phone call using SIM800L module

I made a board to make a phone call using SIM800L module. A PIC16F886 does the main roles, a PIC12F683 plays an audio message from a 24C256 EEPROM using PWM and sends it to SIM800L. The audio message ...
Vahid's user avatar
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1k views

What exactly is a SIM card?

Does a SIM card consist of only Flash memory or is there a microprocessor inside as well?
Vishal Sharma's user avatar