Are there any apps available that will allow a wifi only tablet
to send and receive sms/mms?
Sorry to hear about your dog. They truly become part of the family...
Google Voice will allow you to send and receive SMS messages over wifi, but not MMS. I do not know why. There is a delay so if you like to have a rapid fire texting marathon it's going to be an issue. Then there is the issue of people having to initiate a text message but to what number? The GV number or your cellular number. You can have GV forward texts to your phone, but it's really just a kludge and you will end up missing a message. Plus, you cannot initiate a text message from the GV client on your tablet via GV and have it delivered showing as from your cellular number. If your cell number is 123-456-7890 and your GV number is 456-789-1230, until word gets around no one is going to recognize a text from you coming in on your GV number.
As far as a wifi tablet sending & receiving SMS/MMS on it's own, here's the deal. The hardware supports it, the firmware supports it, and the software supports it. The problem is it doesn't have a phone number and it's not intergrated into somebody's SMS/MMS server. GV gives you a phone number and has a SMS server. The client on your tablet handles the message delivery & notification. It's a poll system instead of push so there is a delay. I do not know the minimum time between polls, I think it's 5 minutes. If you are on battery a short poll period will affect battery life because it has to initiate a connection to the server to poll. The workaround is to have GV forward texts to your email and if your email is set for push then you will get instant notification of a text. This is a kludge too because if a text comes in, you get an email notification. Personally I don't check my email every time I get a new message notification because I just don't really want to. This would force you to have to do this.
I have been very satisfied with my Dell Streak tethered to my phone. It works very well & I don't believe you will be disappointed with what you are wanting to do.


