My phone kept rebooting itself, so I took it to Sprint and they did some hard boot re-set I guess. All is well except that it is not receiving text messages.
Don't know if something got unset somewhere.
I use Advanced Task Killer, but have uninstalled.
Some one said send "allow all" to 9999, which I did.
Of course have re-started many times.
I also use a 3rd party text app called Chomp, but didn't add until I was already having trouble with Messages, hoping it might turn on the proper service or whatever.