Data-only SIM for USA?
 

I'm coming back to US for few weeks and will mostly be needing to do SMS, and perhaps some google maps viewing (< 25MB per day)

Is there a good deal for getting a data only sim? What are my options?

Thx

T-Mobile has a data only SIM - but it is indeed data only. No SMS, no voice. You can check out the terms on their website (Unsupported Browser) but they are fairly reasonable.

AT&T has data packages you can add to its voice SIM. This will let you do your SMS too, of course, and you can just ignore the ability to make calls if you like, although for making local calls it can be very convenient.