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.

Filter by
Sorted by
Tagged with
2
votes
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. ...
6
votes
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 ...
4
votes
2answers
1k views

Electrical reset to a SIM card

I have a SIM card reader connected to an ARM, and I'm trying to get the SIM to send an Answer To Reset (ATR) and to get the reader to capture it. As I understand, an ATR is sent after an "electrical ...
6
votes
2answers
918 views

SIM card: Detected when the card is removed

I have an STM32 with a SIM card reader. For some reason the DETECT pin interrupt is triggered when the SIM card is removed, as opposed to when the SIM card is ...
7
votes
1answer
7k views

Determine the operating voltage of a SIM card

I'm trying to get my SmartCard reader to communicate with my phone's SIM card. I have a level shifter to drive 1.8V and 3.0V SIM cards, but the Wikipedia article specifies that there are also 5.0V SIM ...
2
votes
4answers
11k views

What kind of SIM are these?

I have a device (XT107) that requires a SIM card. It takes a SIM card that have cobber plate (not sure what to call that) that supports all 8 curcuits on the device. When speaking with people, some ...

1
2