Anybody have GSM module circuit?

[alah]

I´m new to this so two questions:
Do CDMA phones use a GSM module?
Are all SIM card phones GSM?

 

[Shaheers]

CDMA and GSM are different cellular data transmission technologies,
CDMA does not use GSM
GSM does not use CDMA
All phones have respective modules.

 

[tpetar]

CDMA
https://en.wikipedia.org/wiki/Code_division_multiple_access

CDMA (Code-Division Multiple Access) refers to any of several protocols used in so-called second-generation (2G) and third-generation (3G) wireless communications. As the term implies, CDMA is a form of multiplexing, which allows numerous signals to occupy a single transmission channel, optimizing the use of available bandwidth. The technology is used in ultra-high-frequency (UHF) cellular telephone systems in the 800-MHz and 1.9-GHz bands.
The CDMA channel is nominally 1.23 MHz wide. CDMA networks use a scheme called soft handoff, which minimizes signal breakup as a handset passes from one cell to another. The combination of digital and spread-spectrum modes supports several times as many signals per unit bandwidth as analog modes.

https://searchtelecom.techtarget.com/definition/CDMA

https://www.m-indya.com/cdma-vs-gsm.php

https://gizmodo.com/5637136/giz-explains-gsm-vs-cdma

**broken link removed**

 

[tpetar]

Excuse me, I´m new to this, so 3 questions:
CDMA phones won´t work? because they don´t accept AT commands?
ALL SIM card phones are GSM and will work?
Wher do You get these phones,tpetar? Thanks.

Thise phones supports AT commands, and I buy thise phones over ads. They are cheap, of course if you have lots of money you can buy new phone with AT commands.

That list what I post, that is list of Siemens phones which supports AT commands, of course list is probably longer but I know for thise models.


Look this for Nokia CDMA AT Commands :

 

[securityforum]

security forum

Security is the protection of information assets through the use of technology, processes, and training. **broken link removed** is the board for General Discussions which provides a brief description of the issues that should be related to Hardware security.



Thank You

 

[tpetar]

Re: security forum

Security is the protection of information assets through the use of technology, processes, and training. **broken link removed** is the board for General Discussions which provides a brief description of the issues that should be related to Hardware security.

Hi, securityforum,

I dont understand post and link with thread, sorry. Can You give additional thinking?

 

[Hoe]

Hi Guys ...!!!
I have a problem and have reached this forum with lots of hope...:-(

I just got a gc864-quad sim card module.
I need to make a circuit for this module to so that this module is able to send sms automatically whenever it recieves any value from a desired remote device.

Any help will be appreciated...

 

[poonam1108]

my gc864 is not giving sim signals. pls help!!!