Samsung Blaze with AT&T (instead of T-Mobile)

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http://forum.xda-developers.com – I have a Samsung Blaze (originally for use with T-Mobile) and would like to use it on the AT&T network. It is already unlocked. I can make/receive calls and texts with my AT&T sim in the phone. On AT&T's network, my fastest speed test so far is around 7 Mbps down and around 1.2 Mbps up. I have been reading for a while now in these forums about how it is possible to flash a different software modem into various Samsung phones in order to get better functionality or data speeds while using these phones. If I want to get faster download speeds or even functionality with AT& (HowTos)