I updated my fiancées iPhone 4 last night to 5.1 and now it has no 3G connection. It shows it has 3G with 4 bars of service but when she goes to Facebook or what's app it says there's no Internet connection available. Any ideas?
I get this ocassionally too. As the previous poster says, try flipping airplane mode on/off, or restarting the phone.
If that doesn't solve it, I assume I have a good signal but that the cell tower is swamped. Vodafone in the UK used to get this all the time at Liverpoool St Station in London; the entire City (financial district) was on Vodafone, so standing under the cell tower does no good is everyone else around you is also using it ..
Other times I've had it have been where the network operator has had an issue. Once they fix that, I'm back online.
Unfortunately we rely heavily on 'always-on' 3G+ mobile connectivity & it's just not really there yet - even in & around London I frequently have little / no / poor signal. It's very frustrating, but an opportunity to practice your Zen calm ;-)
Thanks for all the suggestions guys. Once she got home from work i played with her phone and figured it out. Because "Base" isn't a real iPhone carrier you have to set the APNs for everything. Well when i updated her phone the Internet apn got erased. I pulled out her Base contract stuff and put the APN back in and everything is good to go again. She was a little upset she had to go a whole day without Facebook. HA. But lesson learned, next update i will check to make sure that stuff doesn't get erased.
Your solution obviously won't apply to me, but I wanted to chime in since I'm having the same problem on AT&T since upgrading to 5.1. After my upgrade I had to reset my network settings to get a solid connection. Before I did that my phone would drop the 4G (4G, what a crock, but anyways...) indicator completely and I'd have no Internet service. I have solved that problem by resetting the network settings. However, I occasionally have seemingly lost the connection even though the 4G indicator is still there and have to restart my phone to get it back.
Pretty annoying. I just had to do the same thing to my sister's phone as she was having the same problem