On Friday, June 13, 2014 2:31:51 PM UTC-7, S Viemeister wrote:

>
> We bought our current phones unlocked, from Google - they will accept
> both our US (T-Mobile) SIMs, and our UK (Orange/EE) ones.

T-Mobile and UK Orange are both GSM networks, if I recall correctly, making
changing networks a simple matter of switching SIMs.