If you're building your own cell modem, then, probably. In terms of "finding hardware that can do the following things," pretty much any cell phone sold will s

If you're building your own cell modem, then, probably. In terms of "finding hardware that can do the following things," pretty much any cell phone sold will support voice and text - though some don't do a great job with MMS. The web browser requires orders of magnitude more resources than voice/text, though. A Nokia from 20 years ago, with... I actually can't find how much RAM or storage, had no problems with voice or text. Wouldn't run a browser at all, though. I was admittedly of the impression that most of the voice work was handled by the baseband, though. I've not built my own phones, unfortunately. I just use some basic flip phones for mobile use.