I've been talking to Sprint store reps and a lot of them are now discouraging people from buying the EVO. Its so sad too that HTC failed with this phone.
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Carrier files could contain the PRL update, however, their is an actual separate carrier file for the phone. What those do, I can't remember, but they usually come in OS updates, and very rarely as separate updates.
I don't know. I just got mine on Black Friday & haven't been to any LTE areas yet. There are a few others that have been having an easy time with LTE on theirs.