> 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.
>=20
> Then I realized that using a complete cell phone may be simpler and less
> expensive.
>=20
> 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 d=
evice
> when connected to a PIC32 or ARM Cortex-M3 USB port?

You may like to consider another option - MiFi.

Look on Amazon for "mifi unlocked" and you can get a wireless hotspot that =
uses a SIM card to connect to the phone network to give you data access. Ty=
pically they will allow something like 5 to 8 devices to connect. The one I=
 have cost me around GBP =A343 from Amazon.

Possibly usable as a quick way to connect if you already have wifi on your =
device.

Sorry for delay in replying, been off the 'net for several days.


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