Unlocked phone keeps changing from Orange to Tmobile?

Elle

New member
Bought a new unlocked phone the other day and it works with my orange sim card fine and everything. But today I am traveling up from Devon to London to see family and for some reason it keeps changin from T Mobile to Orange the whole way up. I think I remember 2 service providers joining signals which means better signal. Was that Orange and T Mobile that did it?? Just a little confused by it. Thanks
 
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