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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27 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 ...
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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 ...
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SIM800 Doesn't Give GSM Location

I have problem to get exact GSM location using SIM800L. I have followed instruction in manual. But my module just give me latitude = 0 and longitude = 0. This is what i do with my Serial Terminal. <...
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77 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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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 “+...
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260 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?
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1answer
68 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 ...
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1answer
60 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 ...
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159 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 ...
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190 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 ...
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1answer
77 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 ...
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680 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 ...
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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 ...
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1answer
354 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....
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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 ...
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1answer
650 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 ...
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1answer
193 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....
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1answer
107 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 ...
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2answers
671 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 ...
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1answer
328 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, ...
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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 ...
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2answers
309 views

What exactly is a SIM card?

Does a SIM card consist of only Flash memory or is there a microprocessor inside as well?
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1answer
484 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 ...
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1answer
307 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 ...
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4answers
6k 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'...
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2answers
97 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 ...
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1answer
932 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 ...
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1answer
468 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 ...
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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
423 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]
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3k 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 ...
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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 ...
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2answers
476 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 ...
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2answers
840 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?
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162 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 ...
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1answer
780 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 ...
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1answer
579 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 ...
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2answers
366 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 ...
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2answers
2k 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/...
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1answer
864 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 ...
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2answers
567 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 ...
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1answer
953 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 ...
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3answers
13k views

What is the difference between SIM300, SIM900 and SIM900A [closed]

I have came across these SIM modules on an online electronic shop. My primary target is just to receive short text messages from other subscribers. But then this question about these three (if there ...
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1answer
198 views

Doubts related to SIM300 power rating and its configuration?

I just started reading SIM300 data sheet (http://probots.co.in/Manuals/SIM300.pdf). Under the section 5.3 Power supply ratings.I have few following doubts i) peak supply current transmission is ...
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611 views

SIM cards not responding to SIM908 module

I have a SIM908 module on a dev kit board. I have three SIM cards that are all detected fine on the previous version of the board. However, the v2 only detects one out of the three SIMs. I put the ...
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2answers
2k views

SIM card for SIM908 module

I just got this SIM908 dev board, and I'm trying to get it working. However, it keeps telling me "SIM not inserted": AT+CPIN? +CME ERROR: SIM not inserted which ...
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1answer
118 views

3g internet,sms unit and sd card unit [closed]

I am writing down the requirements i need to make a simple device which uses a micro-controller.The plan is simple.I have split the device core components into two. Component 1 ...
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1answer
3k views

Sending Multiple Messages using Sim300 gsm/gprs module

I have interfaced SIM300 Gsm module with lpc2468 through UART. My main motive is to send SMS when some special sequence run. Now my requirement is that I should send the same messages to two numbers. ...
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3answers
3k views

Ways of Switching between Two Sim Cards

I'm interested in building a circuit to switch between 2 sim cards, and found a design guide by GSM module manufacturer Telit. (New design guide link here, see pg. 16+) In particular, "Figure 6" of ...