You know when you are driving, the 4G connections can get a bit iffy on the HTC Evo 3D or 4G. Well, this is because Sprint sets default reconnect time for 4G WiMax at 5 minutes, meaning it won’t even “try” to connect to 4G again until 5 minutes is up.
But we can hack the phone’s WiMax settings to get it re-connected to 4G as soon as it can. This will however drain the battery more but if you absolutely want the fastest 4G (and you can always simply turn off 4G when not needed), you can do this hack.
Like we did for the faster 3G/4G hack, you need to get the MSL code of your phone by installing the MSL Reader app off market.
Second, get into the phone’s settings by dialing ##3282#.
Choose “Edit Mode”.
Enter the MSL code you got earlier for password.
Change “WiMax Entry Delay” from default 300 seconds (5 minutes) to 0.
Change “WiMax Scan Retries” to 15.
Credits to user swatspyder at XDA for the hack!
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