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They have been a bit forward thinking so phone networks only get some digits after.
http://www.area-codes.org.uk/07-mobile-codes.php
If it gets too bad everything will just go online so you call emails and stuff like many are doing already.
Clockwise
gbj_tester
The theoretical maximum number of UK mobile numbers as we use them now (07xxxxxxxxx) is 10⁹, so we shouldn't be close to exhausting them yet. About 5×10⁸ have been issued so far, but we're ripping through them ever faster as more and more things get mobile connectivity (cars, utility meters, security systems, basically anything where remote monitoring is required)
All the time. Apparently only 10-20% of issued numbers are still active (must be more people using burners than we thought), so inactive ones get deactivated and thrown back into the pool to be reissued.