I've tried all the major carriers and some of their own other brands as well as some of the MVNOs.
I'm happy to recommend VOXI at this point - it runs on Vodafone / Three networks - as you may be aware those two are merged into one so coverage has a good chance of being usable. In some areas it will be better and others, worse - that is just the reality.
But you can try it first before switching your nunmber across.
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