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.
61
questions
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1answer
20 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 ...
2
votes
1answer
31 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 ...
0
votes
1answer
19 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
vote
0answers
45 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.
...
0
votes
2answers
59 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 ...
0
votes
0answers
25 views
Is it possible to connect to a cellular network using an external SIM card reader?
I know that external SIM card readers exist for reading data off a SIM card. If a phone's internal SIM card reader was damaged or if someone just wanted to add dual SIM capabilities to a phone, could ...
1
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0answers
66 views
How to connect the SIM7600X directly to the nvidia jetson nano
I'm working on modifying the Nvidia jetson nano carrier board to include a network chip like the SIM7600E-H.
~ How do I understand this while connecting this chip to the carrier board . The complete ...
1
vote
1answer
37 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 ...
0
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0answers
18 views
SIM800l Replies with a delay. Http Get
I trying to use http get method on SIM800l (mcu for controling SIM800 is STM32F407VGT6). I can send SMS message or read all/specific SMS message but with http methods I'm in trouble(power supply is ...
1
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1answer
260 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 ...
0
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0answers
155 views
Sam card vs sim card slot
I was wondering if it is possible to read a SAM Card in mini sim format with an standard sim module for gsm connection. I'm not sure if a SAM Card and a SIM Card are the same thing just for different ...
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0answers
33 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 “+...
0
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1answer
411 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?
2
votes
1answer
83 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 ...
0
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1answer
70 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
1answer
226 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 ...
0
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0answers
208 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 ...
0
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1answer
85 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
1answer
1k 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 ...
0
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0answers
1k 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 ...
4
votes
1answer
393 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....
0
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2answers
3k 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 ...
0
votes
1answer
695 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
1answer
210 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....
0
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1answer
111 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
vote
2answers
709 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 ...
3
votes
1answer
336 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, ...
1
vote
1answer
3k 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 ...
0
votes
2answers
364 views
What exactly is a SIM card?
Does a SIM card consist of only Flash memory or is there a microprocessor inside as well?
1
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1answer
521 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 ...
0
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1answer
319 views
sim808 GNSS location update
I'm working on a project in which I have to get current location at every 10 sec interval. I've used sim808 (GSM/GPRS & GNSS) using which I execute AT+CGNSINF command to get the location. I get ...
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3answers
2k 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 ...
0
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4answers
7k 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'...
1
vote
2answers
101 views
SIM card power supply design, from 3V/50mA into 2.7V/10..100mA
I am designing a SIM card with RF radio included. The radio with its CPU needs minimum 2.7V to run. The current consumption is my problem:
- for a period of 50msec (during transmission), it requires ...
1
vote
1answer
1k views
Smart Card (SIM) clocking requirements
I'm trying to implement a SIM card interface using TI TM4C123XL. I have a question about a clock. TI MCU seems to provide possibility to interface smart cards but don't let me multiply clock without ...
0
votes
1answer
471 views
GSM Data Post Over the GPRS Using GSM Modem [closed]
I'm using GSM Modem To post the data over the GPRS for specific website.
when i'm posting the data using VODAFONE IN (APN: www) Sim card it pos the data in i'm recieved
HTTP 200 ok Response
But ...
0
votes
1answer
4k views
PWM signal to SIM800 MIC noise reduction
I have an audio signal made by PIC microcontroller using 20KHz PWM (It passes through a low-pass filter). It is very clear on an 8ohm speaker. But when I connect the output to the MIC inputs of SIM800 ...
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1answer
436 views
Why do some GPS devices require a GSM SIM-card?
Why do GPS products like [Image A] always require a GSM (or similar; i.e. 3G, 4G, etc.) SIM-card?; Whereas typical in-car GPS navigation devices, etc. like [Image B] don't?
[Image A]
[Image B]
-2
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1answer
4k views
sim card power consumption [closed]
I am trying to calculate the power consumption of a SIM card.
I found some SIM card working between 1.65V and 3.3V, but I did't succeed to find information about the current they draw.
Does anybody ...
0
votes
3answers
2k views
SIM Cards are using a Microprocessor or Microcontroller?
I'm getting different answers on various websites (Wiki, Online University courses, fan pages, etc...) and can't get to decide. That would mean there are SIM with Microprocessors and some with ...
1
vote
2answers
527 views
Why cellular modems (still) need a SIM card?
I'm designing an embedded system that will require a cellular modem (3G). I never used one but the designs I came across with they all use a SIM card slot.
I understand that this may be convenient but ...
3
votes
2answers
883 views
SIM card as IC component?
I read somewhere a few weeks back that a company is making SIM cards as IC chips for the "Internet of things". I can not find the article again or find anything about it on Google. Did I make this up?
0
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2answers
171 views
sim card sizes. Why start with the big one
Sim cards come in various sizes standard(1ff), mini(2ff), micro(3ff) and nano(4ff).
Many questions I see tend to say there are many advantages to using the smaller size such as placement within the ...
0
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1answer
825 views
What is the difference between ID-1 sim & Plug-in Sim cards?
Firstly, please forgive me if this is not the right place to this question. I was confused and couldn't understand where to ask this question.
I want to know in simple terms, what are difference ...
3
votes
1answer
609 views
Is it possible to multiplex SIM cards using a CPLD?
I am building a hobby project using a GSM module and would like to be able to switch between multiple SIM cards, in case one stops working or I have poor reception on one provider (the project will be ...
3
votes
2answers
384 views
Push-Push SIM card holder ESD protection required?
We are using this SIM card holder in one of our designs. The SIM card can be inserted into the slot and fixed/released by gently pushing it in. So the contacts are protected from touching.
Would you ...
6
votes
2answers
3k views
Make a simple sim card reader circuit
I'm trying to implement a sim-card reader for my own. I followed step by step the guide on www.ladyada.net site but it does not work as it would be. My PC and softwares i used to read/write data from/...
3
votes
1answer
883 views
SIM card used as secure storage with AVR
I would like to use a regular SIM card to store an AES key to be used by an AVR micro-controller. I think that a SIM is secure enough (isn't it?).
My problem is that I can find nothing about ...
3
votes
2answers
573 views
simple GSM SIM modem
I'd like to build a prototype of simplest possible GSM device - a simple modem with SIM holder, capable of logging on to the SIM's provider network and nothing else. It's meant to be used as a GSM ...
1
vote
1answer
956 views
SIM900 email send recive Firmware > 1137B11SIM900M64 ST? [closed]
I just received what I believe is the latest version of firmware SIM900, 1137B11SIM900M64 ST. I did the upgrade and
I try to implement without any results, commands reported in ...
