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Suggestions for a cheap cell phone that can work as a modem?

 
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arunb



Joined: 08 Sep 2003
Posts: 492
Location: India

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Suggestions for a cheap cell phone that can work as a modem?
PostPosted: Sun Jun 29, 2008 3:25 am     Reply with quote

Hi,

I would like to use a cell phone or a GPRS modem in my project so that it can be accessed remotely, (for servicing etc.)

Are there any cell phones or GPRS modems (or any other device) that can do the job ???

thanks
arunb
ckielstra



Joined: 18 Mar 2004
Posts: 3680
Location: The Netherlands

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PostPosted: Sun Jun 29, 2008 6:16 am     Reply with quote

Is this for a commercial project or hobby?

For hobby I recommend to buy a cheap and old GPRS capable telephone with serial RS32 port. Most new phones have an USB connection which is difficult to interface to a PIC.

For a commercial project you want to be able to buy the same phone or modem over the next couple of years. That leaves out the phones as these are replaced every half year. Modem (modules) are replaced less often and the new models are backwards compatible so these are a better option but are more expensive.
Well known manufacturers are Siemens, Wavecom and Telit.
Prices for embedded GPRS modules start at €70.

An interesting option is the new modem modules having lots of memory and CPU power and allowing you to add your own program into the modem. Why use a small and slow PIC processor when you can use the modem's powerful 32-bit ARM processor and huge amounts of memory?
Examples are:
- Siemens TC65T, programmable in Java, ARM7, 1.7Mb Flash, 400kb RAM.
- Wavecom Fastrack Supreme, program in C/C++, ARM9, 87MIPS, 1.5M Flash, 256k RAM
Prices... close to €200.
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