Telephone numbers, part of UK system 01624 and 07624
All telephone numbers start with 01624 which is effectively within the UK telephone network.
So from abroad you dial +44 1624 xxxxxx
Telephone systems are run by Manx Telecom.
Mobiles in the Isle of Man start with 07524, 07624 and 07924
So from abroad you dial +44 7524, +44 7624 and +44 7924
Manx Telecom have roaming reciprocal agreements with other providers.