There are some GPRS modules from Siemens that lets you to transfer data
from rs232. You just send/recieve some strings to it via rs232 and viola ;
your request is sent/received. I have done it with 18F and 16F, can provide
some stuff if you need it.

Cheers.


On Tue, Apr 16, 2013 at 5:12 PM, Isaac Marino Bavaresco <
isaacbavaresco@yahoo.com.br> wrote:

> Hi All,
>
>
> I need to add GPRS communications to a project. I was planning to add a
> GPRS module on-board (SIM900), but the modules are expensive and I would
> need to certify my board with the telecommunications authority.
>
> Then I realized that using a complete cell phone may be simpler and less
> expensive.
>
> Does anybody have experience in this area? What are the cheapest cell
> phone that support GPRS tethering? Do exist any modern cell phone models
> that support RS-232 yet? If not, will the cell phone work as an USB CDC
> device when connected to a PIC32 or ARM Cortex-M3 USB port?
>
>
> Best regards,
>
> Isaac
>
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