UK Alarm base station 3G back up network

So, I just installed my alarm yesterday and saw that I connected to EE with 3 bars. This morning I see I am on one bar so-called Ring as I had seen a post on here about a 'neighbour' being on O2. After 2 calls, to see if I can change networks, I've been told it's not possible as the devices are locked into AT&T. When I asked what network it uses in the UK, they didn't know at first and said its AT&T. After a long debate of me saying it must be roaming and being told it isn't, I googled and found AT&Ts roaming partner in the UK is EE. Please Ring, can you start supporting the UK a bit better on these things, I had to google who I should be connected to whilst I was on the call after saying AT&T isn't a UK network. I hope this helps others in the UK looking to purchase a Ring Alarm and use the 3G backup as EE isn't the strongest of signals in a lot of places, I'm now going to have to send it all back as EE is the worst network for me and the 1 bar I have now, wont always be there (and can't trust it), such a shame.