3UK activation in USA?

[rfranzq]

Originally Posted by Bossman

Sure. Good to know. I'll be doing the same for my 3-UK sim as well, when it's time for me to head to the UK around August.

On the web site it was saying it could be up to two hours to activate.

I was receiving textmessages in about a minute after it connected to AT&T.
It also use T-Mobile. [One thing you will not want to do is call a USA number. GBP1.40 to do that. Calling UK number, texts to US and UK cheap. Read up on "Add-Ons" .]
Order I did things.
1. Stuck SIM in phone.
2. Registered with MY3.
3. Paid GBP10 via https://www.mobiletopup.co.uk/ Service charge of 1.49 GBP.
4. Started testing.

For everyone, here is a good link to start to familiarize yourself with this plan/offer.
http://www.three.co.uk/Store/SIM/Pay_As_You_Go

Since Three will not mail you a SIM, ebay is a good place to look for
inexpensive Three SIMs.