Yep, there's a bunch of them.
Some work and others dont depending on your location.
Good to have them and try them all till you get the right one.
My brother is using the internet 2 for over a year now on tmobile.
No, texting will work as soon as you unlock.
MMS though is really tricky on 4.0+
Some patches out there claim to have a working fix but a few that i tried failed.