228 isnt working for me either. I have a Samsung Galaxy s4 and I am out of town and the signal is not its best. I used to get perfect signal when living here so I know I can boost the signal just dont know how.
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You don't dial *228 to update the PRL on a 4G phone, that's handled automatically by the SIM card whenever you reboot the phone. You also could try resetting the SIM card by turning off the phone, removing the SIM card (be careful not to touch the gold contacts), waiting a few minutes, then reinsert the SIM card, turn the phone back on, and allow it a few minutes to establish a fresh network connection.
I solved the weak signal problem in my home by getting a Network Extender from VZW. The only problem with the extender is you only have 3G service. You also must have 1Mbs of upload speed for the extender to work.