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.
79
questions
0
votes
1
answer
56
views
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 ...
- 39
0
votes
0
answers
33
views
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....
0
votes
0
answers
42
views
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 ...
0
votes
1
answer
145
views
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:
...
0
votes
0
answers
21
views
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 ...
0
votes
1
answer
70
views
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 ...
- 11
-1
votes
2
answers
69
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 ...
- 101
0
votes
0
answers
34
views
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 ...
- 402
2
votes
0
answers
63
views
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 ...
- 147
1
vote
0
answers
39
views
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-...
2
votes
1
answer
1k
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-...
- 21
0
votes
1
answer
325
views
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 ...
- 1,223
2
votes
0
answers
237
views
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 (...
- 21
-1
votes
1
answer
177
views
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 ...
- 1
0
votes
0
answers
164
views
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 ...
- 15
0
votes
1
answer
165
views
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 ...
- 15
1
vote
1
answer
633
views
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 ...
- 1,223
0
votes
1
answer
70
views
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 ...
0
votes
0
answers
227
views
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 ...
- 157
0
votes
2
answers
96
views
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 ...
- 9
0
votes
1
answer
205
views
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:
...
- 121
0
votes
0
answers
943
views
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 ...
1
vote
1
answer
964
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 ...
- 131
2
votes
1
answer
243
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 ...
- 377
0
votes
1
answer
280
views
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 - ...
- 1
1
vote
0
answers
729
views
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.
...
- 377
0
votes
2
answers
438
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 ...
1
vote
1
answer
110
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 ...
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 ...
- 45
0
votes
0
answers
177
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 “+...
- 121
0
votes
1
answer
2k
views
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?
- 3
2
votes
1
answer
216
views
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 ...
- 1,316
0
votes
1
answer
386
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 ...
3
votes
1
answer
951
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 ...
- 33
0
votes
0
answers
407
views
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 ...
- 87
0
votes
1
answer
139
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 ...
0
votes
1
answer
6k
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 ...
- 103
0
votes
0
answers
2k
views
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 ...
- 133
4
votes
1
answer
599
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....
- 1,834
0
votes
2
answers
8k
views
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 ...
- 111
0
votes
1
answer
897
views
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 ...
1
vote
1
answer
357
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....
- 65
0
votes
1
answer
138
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 ...
- 1,378
1
vote
2
answers
928
views
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 ...
- 41
3
votes
1
answer
462
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, ...
- 45
2
votes
2
answers
4k
views
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 ...
- 287
0
votes
2
answers
957
views
What exactly is a SIM card?
Does a SIM card consist of only Flash memory or is there a microprocessor inside as well?
- 193
1
vote
1
answer
903
views
One SIM card shared between two devices - IC? [closed]
i have a GSM breakout board and a 4g dongle. I'm curious whether it is possible to share one SIM card between both of them? Does anyone know if there is any IC available to do this?
edit: Only one ...
- 125
1
vote
3
answers
3k
views
how can i switch sim card clock signal line betweem two sim cards?
My setup is as on png above, I am using sim800L gsm module, by trial and error i discovered that i can connect sim pins: (rst,gnd,io and clk) and the module detects and connect to GSM without ...
- 11
2
votes
6
answers
11k
views
SIM800 PWRKEY - Automatic start
I need to do when the module have connected power supply, it will automatically turn on the module. Because is there a PWRKEY button, probably grounding it or give on that pin VDD_EXT will not work.
I'...
- 135