Hi guys. I'm a bit lost. Sorry if I ramble, but I just want to make sure I cover everything. Thanks for reading.
I took out a new contract with O2 for 24 months, unlimited calls/texts and 5GB data. It's a Nokia Lumia 925. The 5GB of data was the main attraction for me in buying the phone, and is what takes up the majority of my tariff cost, but it's currently unusable.
The phone arrived on Monday and I've only been able to get a 2G connection, whereas for the previous four years I've been with O2 I was always able to get a 3G connection in this area with zero issues.
O2 emailed me the settings required to activate WAP/MMS on my phone. I entered them and have double-checked and triple-checked. Still only 2G. I asked Support if there were any issues they knew of and there aren't. They checked my street and I should be getting perfect 3G. They emailed the settings again. I entered them again and reset the phone. Still no luck. A factory reset was suggested, and then to enter the settings a third time. Still no luck.
This is where it gets slightly complicated... 
...I phoned Support last night and after going through everything again, and ruling everything out, we spoke about my old handset (iPhone 3) and old sim card, and recent problems that I was also having with only getting a 2G connection on those over the last few weeks. Now, I thought that this was because the old phone was just deteriorating in general (very short battery, random crashing etc.). But the guy on Support suspected that this may have been a 'very rare' case of me having an overall account issue. We also established I was having these issues throughout Edinburgh and not just in one area.
So he suggested I be disconnected from the network overnight. Then, in the morning, after I had been reconnected, hopefully everything would be fine and I'd get a 3G signal no problem. So I went the night with no coverage. In the morning, the O2 network/coverage returned... but still only 2G.
As a side note, I then got a bill emailed through from O2 for £144, which I phoned to ask about. Basically, because I got disconnected and reconnected to the network, this was sent to me in error and I shouldn't worry as they're currently sorting it. It seems my airtime plan also got cancelled as a result and that needed to be fixed.
So, then I raised the original issue again of having only 2G and not 3G. This time, the settings were sent directly to my phone so I didn't need to do anything other than activate them. I activated these settings in Access Point and... still only 2G.
I'm not really sure what to do next. If the problems persist, I'd really like to just get out of the contract and give the phone back but I'm worried this may not be possible and I'll be stuck paying for 5GB of data each month that I can't use. It would also be a shame as I've been with O2 for years with zero problems and I'd like to solve this rather than just cancel. I'm not really sure what to ask Support next... Disconnecting/reconnecting me to the network seemed to be the last resort.
Hopefully it doesn't sound like I'm complaining. I'm not. Support have been very helpful etc. I just don't know what to do now, other than trying to return the phone, cancel the contract etc. Would I be able to just go in-store with the phone, parts and packaging and get this sorted, do you think? It's just quite difficult to reach an O2 store due to working commitments.
Basically if anyone has any insight/ideas what to do next, I'd really appreciate it. Sorry for the long post. Thanks.
Hi guys. Another update. As of about 45 minutes ago, 1 bar of 4G suddenly appeared on the phone. Tested it with a YouTube video. Turns out even one bar is very quick!
Since then, it has been alternating between two or three bars on 3G and none or one bar on 4G. This is great as beforehand all I had been getting since Monday was 2G.
Been testing it out and even a few bars of 3G is all I really need. 
The phone is currently updating all its software etc. at a good speed.
Not sure what the sudden fix was. Maybe the new SIM just needed to 'warm up' or maybe the guy instore felt sorry for me and got someone to do some checks on the mast.
I'll keep an eye on it. Thanks again.
