0121 Area Code
The dialling code for Birmingham: what 0121 numbers are, who holds them, and what to do about a call you don't recognise.
What Is the 0121 Area Code?
Birmingham landline number. 0121 is the dialling code for Birmingham. Numbers starting 0121 are landline numbers for that area. Internet phone services can use them too, so a caller is not necessarily in Birmingham.
Who was the range allocated to?
Ofcom has allocated 0121 numbers to 176 providers. The largest holders are BT, Virgin Media Limited and Vodafone Ltd (C&W).
Numbers can be moved (ported) between networks, so the network a caller uses today may not be the one Ofcom allocated the block to. The allocation does not identify the person or business using a number.
Had a call from a 0121 number you don't recognise?
We can't tell you who called: an area code only shows the type of number and the provider Ofcom allocated the range to.
- Don't call back in a hurry, even if a message says it's urgent. Never give bank details or security codes on a call you didn't expect.
- Block the number from your phone's recent calls list.
- Forward scam texts free to 7726. Report unwanted marketing calls to the ICO, and see Ofcom's advice on scam calls.
- Register your number with the Telephone Preference Service to opt out of sales calls.
About the 0121 Range
| Number type | Birmingham landline number |
|---|---|
| Area | Birmingham |
| Number format | 0121 XXX XXXX |
| Allocated by Ofcom | 60% of the range, to 176 providers |
| First allocation on record | 1 January 1994 |
| Most recent allocation | 24 July 2026 |
Largest holders of 0121 numbers
| Provider (as allocated by Ofcom) | Share of range | First allocated |
|---|---|---|
| BT | 23% | 1 January 1994 |
| Virgin Media Limited | 6% | 14 January 1998 |
| Vodafone Ltd (C&W) | 5% | 18 June 2013 |
| Gamma Telecom Holdings Limited | 2% | 4 December 2002 |
| GCI Network Solutions Limited | 1% | 30 March 2017 |
| Sky UK Limited | 1% | 10 June 2013 |
170 more providers hold smaller blocks.
Allocation data: Ofcom numbering data, as published 28 October 2026.
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Common Questions About 0121 Numbers
Where is the 0121 area code?
0121 is the dialling code for Birmingham. Numbers starting 0121 are landline numbers for that area. Internet phone services can use them too, so a caller is not necessarily in Birmingham.
Is 0121 a mobile number?
No. 0121 is a landline (geographic) area code for Birmingham. UK mobile numbers start with 07.
Who does the 0121 range belong to?
Ofcom has allocated 0121 numbers to 176 providers. The largest holders are BT, Virgin Media Limited and Vodafone Ltd (C&W). Numbers can be moved (ported) between networks, so the network a caller uses today may not be the one Ofcom allocated the block to. The allocation does not identify the person or business using a number.
Who called me from a 0121 number?
We can't tell you who called. An area code only shows the type of number and which provider Ofcom allocated the range to. If you don't recognise a 0121 number, don't call back in a hurry, and never give out bank details or security codes on a call you didn't expect.
Block the number from your phone's recent calls list. Forward scam texts free to 7726, report unwanted marketing calls to the ICO, and see Ofcom's advice on scam calls.