First thing to do is take out the battery and put it back in. Once it powers up, then turn on 4G. Also, if that fails, verify we officially have 4G in your exact location. ( www.sprint.com/coverage) After that, you can try a factory data reset (home/menu/settings/privacy/factory reset) but make sure to back up your personal information first. If all of those steps fail, then you can take it to a Sprint Service & Repair Center for diagnostics.
Its not only your phone, its a known issue recently that Sprint does not want to acknowledge. Mine has been doing the same thing for over a week. Heres a link to other complants. http://forum.xda-developers.com/showthread.php?t=1538070 . Thanks Sprint for your terrible service.
I just found that out last night after of course doing a reset. At the Sprint store all they said was that it was a known issue and there was/is nothing they can do. I know they can credit me my $10.00 data charge for starters. My son has the same phone in another county here in SoCal and his 4G works fine.
I know robotaholic is off today, but I'm starting to see a lot more reports of 4G issues in SoCal region, I'm starting to look into this now to see if I can get it investigated, if anyone has called to have troubleshooting performed and had a network ticket created please post or private message me the ticket number, if you're willing to go through full troubleshooting to have a ticket created on this issue you can either send me a private message or call our technical support at 888-211-4727
I had this same issue, around the same timeframe. (I'm also from SoCal). I was told by a Sprint Tech that the nearest 4g tower was in Santa Fe Springs (I live in Chino) - with the influx of new 4G phones being purchased in SoCal, the available connections (and bandwidth, of course) are being snapped up. When I traveled to an area without 4G, I somehow was disconnected from the network and was just having a difficult time re-connecting once I returned because of the number of 4G users connecting to the one, closest tower. She clearly implied that my connection to the tower had been released and someone else had filled the void. It was suggested that if I travel again to an area that DOES have 4G, connect to the network there - turn off my phone in that service area (no problem because of airline requirements), and turn it back on in my home network area and I would still be connected to the system. As crazy as it sounds, it actually appears to have worked. Since returning, I've been able to re-connect to 4G services.
Another theory I'd heard was that it was because of the solar-flare that occured about the same time...
Shane - have you continued to hear of problems, or is it 'fixed' for everyone?
RexicoBurress, it sounds like your profile is having a hard time following your phone. Sprint maintains a network of servers around the country. At any given time, the profile for you device, is loaded on two of them. You profile defines what services your subscribed to, and we carry it on two servers as a back up. If one goes down the other can still provide you with service. When you travel and quickly appear in a new location, often times your profile doesn't make with you. The best way to reset your profile is to turn your phone off for at least 2 minutes, (it takes approximately 90 seconds for the servers to release your profile). When you turn you phone on after your profile has been released, the closest server will identify your phone at the new location and request the profile from Sprint's central servers.
Solar-flares affect cellular service very little. Cellular calls are routed from your phone, to the closest tower, to underground fibre-optic cable to the switch of the carrier of the person you're calling. Because of Earth's magnetic field and our atmosphere, very little of the radiation released by a solar flare reaches Earth's surface, certaintly not enough to affect most terrestrial electronics. I cannot say the same thing about satellite based systems (like TV and GPS). -T.