If you live in Orlando and got an evo flashed to metro watch my shop puts 4g on them
Well, that's a bunch of bull.

Come on, dude.
Sprint's HTC EVO Android has CDMA and Wi-Max chips. Wi-Max is Sprint's current "4G" network. (Not really true 4G, but faster than 3G. Call it 3.5G. Still, for purposes of this discussion, we'll call it "4G".)
Anyway, HTC EVO has CDMA and Wi-Max.
HTC Mobile Phones - EVO Sprint - Overview
Networks
- CDMA 800/1900 MHz EVDO Rev. A,
- WiMAX 2. 5 to 2.7GHz; 802.16e
When EVO is flashed to Metro,
only the CDMA part works on Metro's network -- and only Metro 2G, 1x CDMA at that. Not even as fast as Sprint's CDMA network.
MetroPCS does not have Wi-Max network.
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Metro's so-called "4G" is LTE, not Wi-Max. LTE is
another type of network, like CDMA or GSM, but allows for faster speeds and lower latency. The Samsung Craft, Metro's ONLY LTE phone at the moment -- and only a "feature phone" not a smartphone -- has both CDMA
and LTE chips.
The new Samsung Forte (Metro's first LTE Android) will have both CDMA and LTE chips.
So, unless you are saying that you can solder MetroPCS LTE chips inside the EVO, it cannot run on Metro's LTE network. It doesn't have the internal parts to do it. (And it would have to be specific LTE chips that run on Metro's LTE network. Verizon's LTE network uses different frequencies.)
All a flashed HTC EVO can do is run on Metro's slow 2G 1x CDMA network. because it doesn't have Metro's LTE chips inside.
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Even Verizon's upcoming LTE Androids, which will have both CDMA and LTE chips, will NOT NOT NOT run on Metro's LTE network. Different LTE frequencies. Any flashed Verizon LTE Androids will only be able to run on Metro's CDMA network.
So, no Sprint EVOs flashed to Metro will run on Metro's LTE (4G) network. Sorry.