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This is quite strange. Aren't the radios in the XR and the iPhone XS(for example) the same? I wonder what is causing this as its only affecting one specific model and one specific carrier.

I’ve been having terrible reception on my Xs Max with O2 ever since I started using it back in September. Not that Vodafone was much better. And coverage in my area (Cambridge) is supposed to be good.

I have many fewer problems with the same phone in the US, with Sprint.

So my guess is it’s the provider.
 
Is this still going on? I have an 11 pro max on O2 and this morning I haven’t been able to make or receive calls. It just keeps disconnecting.
 
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