Want Better 4G Signal? Do This

[gokuman56]

You will need your MSL, Call Sprint or follow this:

1. Dial ##3282#
2. It will open a menu, click WiMAX and enter MSL. Note: 4G radio must be on.
3. Go to extensions and Hold EntryRX and Write Extension
4. Change the Value to -110 (The Lower the weaker the signal can be for the phone to connect.
5. Change EntryCINR to 0004
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If you are tired of the Radio taking forever to reconnect once you loose your 4G signal, then:
1. Change Scan Retries to 00015
2. Change Scan attempt timeout to 0002

You will now have a somewhat faster and much stronger 4G signal!!!

I found this on a forum somewhere for another phone and reedited it to work on the Epic.

EDIT: Easier Way to get MSL. Okay so you have to download connectbot from the Market
1. Open ConnectBot
2. Agree Next Next Yada Yada
3. Press SSH and select Local
4. type in whatever you want by local and press enter
5. ok once you see a black screen and to the left a cash sign, type in "getprop" without the quotes
6. You should see a lot of words, scroll up all the way at the top.
7. Near the middle of the screen until you see [ril.MSL]
8. It will be 6 digits and that's your MSL
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For 3G Try This..
It may already be implemented in your ROM, just check again:
Steps:
1. Know the MSL
2. Dial ##3282#
3. Go to multimedia
4. HTTPPD Proxy Port must be 0
5. HTTPPD Proxy Address must be 0.0.0.0
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Thanks