It is more likely that poor signal is not the problem, rather too many signals. The radio frequencies used for cellular are repeated at much shorter distances than you might think so often there is a battle between sites when your mobile is getting even a good signal from both. It is very often found when you are on a hilltop. Also don't forget that most (but not all) cell sites use directional aerials which doesn't help the situation either.
Also do remember that EE is (when??!) the infrastructure supplier for the new Emergency Services Radio Network which should have replaced the dedicated Airwave system (originally) a decade ago. The issue is that the cellular providers work on a statistical model based on population, whereas the ESRN needs geographical coverage. The last I saw of it I can't remember how long ago was that the ESRN required (from memory) 348 extra sites to cover no-zones largely in Wales and the North of England even before testing could begin!
Caravan Battery we think is dead even though we have solar
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