Using my phone in the US. And having it work as well as it does in the UK

[Welwyn_]

See the title. 

Even though O2 says it should work here in the US. It doesn't. My phone defaults to T Mobile while I'm in the US. T Mobile shops in the USA have never heard of O2. Although they say they can get my phone working, for money of cause 

Nobody seems to have an answer.

The phone is connected to T Mobile over here. But I  can't get the Internet to work. 

The signal strength is -87 dBm 12 asu.

Wether that has anything to do with it?

[jonsie]

These are some tips to try :

•   Reboot phone.
•   Manually search for a different network
•   If using an iPhone, change data apn to  mobile.o2.co.uk
•   Call customer service to check for any roaming bars
•   Or if you message O2 using the social media links below, they should be able to help you with this

[Bambino · Accepted solution]

@Welwyn_ You're connected to T-Mobile because you're in an area where their signal is strongest. If you move about to other areas you might get a stronger signal with AT&T, but whichever network you connect to or whatever travel bolt-on you have, you won't be able to do much with it, apart from maybe being able to check your email. O2 throttles their data speeds to 500kps, which is exceedingly slow, and doesn't allow you to do much of anything as far as roaming is concerned. See the Terms & Conditions here:

https://www.o2.co.uk/termsandconditions/mobile/o2travel-paymonthly-terms-and-conditions

Also see this: Roaming on O2 - All you need to know - O2 Community

You'll need to use WiFi as much as you can, and there's lots of free WiFi access in many places, but if you want to stay safe, use a VPN. When T-Mobile tells you they can get your phone working for a price, they mean getting a local Pay & Go sim to get you decent internet access. Same would go for AT&T.