I am having the same problem in the UK, so no switching provider. suddenly mobile data stops working for several hours wherever I am in the UK. Big problem when this means, as it has twice in 3 days, I am using Google Maps as a satnav for a long drive. As today, it worked up until around lunchtime, but I noticed no service at all switching back to mobile data from wifi. I've driven for 4 hours, and still nothing.
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