This is the Smarty community forum, we are customers, just like you, we do not work for Smarty.
Also, you have been misinformed - Smarty are owned by Three, it’s Three that own the masts.
I am also surprised that you do not appear to realise that mobile coverage of course fluctuates depending on your proximity, or otherwise, to a mobile mast - If you are very close to a mast, you will get 4 or 5 bars of coverage, move farther away, it will reduce to 2 or 3 bars. In an area with no three mast ? You will get zero bars !
Knowing where Kilmalcolm is, and nearby Auchenbothie, I would be surprised if any network offers consistently good coverage there, as it’s a very rural area.
You probably do need to switch back to the network you just left. Did that network offer good coverage ? Whatever you do, you obviously need a network that offers decent coverage, but given your rural location, you will have to temper your expectations of full 5 bar coverage all the time. I don’t even get that here in Bristol, on any network, because, again, it all depends on your proximity or otherwise to the mast(s) of your chosen network. No one in the UK will get 5 bars all the time, as we all move around from location to location.
