Since upgrading my 4s to ios 6 I've had terrible data speeds. For instance, at work I'm near a Three (UK) mast and always get good speeds, since ios 6 I haven't. For instance, Words with Friends takes about 3 mins to refresh, or to post my move, iMessage progress bar goes to about 95% then sits there for a couple of mins, Safari loads pages really slowly too - or it stops and says no data connection. I've tried my 3G connection in other areas and it's still bad, the only time my phone responds well is when it's on my home WiFi. I have tried doing Reset All Settings, and turning my phone off/on but with no improvement. Any other suggestions? Anyone else with similar issues?