I accidentally deleted a really sentimental text thread, and it really sucks that Sprint has no way to get them back for me! Why can't we have some kind of SMS backup? Because you don't use SIM card technology, there's no way to retrieve some messages that are precious to me.
If you have an android there is a free app SMS BACKUP AND RESTORE that will automatically backup all messages at assigned times/dates. My wife never wants to lose any of her messages so this protects against loss. Sorry you lost the messages but hopefully you wont lose another one.
Larry ~ OKIESTRO