0721 mobile numbers
Ofcom’s numbering data lists 10 number ranges starting 0721. Numbers issued to mobile networks in blocks. The first few digits show which network the block was originally allocated to – but people can keep their number when they switch network.
Explore by the next digit
Each block below starts 0721. Pick one to narrow it down.
What a 0721 number tells you
What it is
Numbers issued to mobile networks in blocks. The first few digits show which network the block was originally allocated to – but people can keep their number when they switch network.
What it costs
Charged as a mobile call; usually included in allowances.
Watch out for
The original network tells you nothing about who owns a particular mobile today.
0721 numbers: common questions
How do I call a 0721 number from abroad?
Replace the leading 0 with +44. For example, a number starting 0721 becomes +44 721 followed by the rest of the number.
How much does it cost to call a 0721 number?
Charged as a mobile call; usually included in allowances.
Is a call from a 0721 number a scam?
The original network tells you nothing about who owns a particular mobile today. Check the full number on Who’s Calling to see if it belongs to a verified business and what other people have reported.
Did a 0721 number call you?
Check the full number to see if it belongs to a verified UK business and what other people have reported.
UK phone numbers explained → · Let us screen unknown callers →