01638 Area Code
The dialling code for Newmarket: what 01638 numbers are, who holds them, and what to do about a call you don't recognise.
What Is the 01638 Area Code?
Newmarket landline number. 01638 is the dialling code for Newmarket. Numbers starting 01638 are landline numbers for that area. Internet phone services can use them too, so a caller is not necessarily in Newmarket.
Who was the range allocated to?
Ofcom has allocated 01638 numbers to 92 providers. The largest holders are BT, GCI Network Solutions Limited and Virgin Media Limited.
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 01638 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 01638 Range
| Number type | Newmarket landline number |
|---|---|
| Area | Newmarket |
| Number format | 01638 XXXXXX |
| Allocated by Ofcom | 50% of the range, to 92 providers |
| First allocation on record | 15 July 1994 |
| Most recent allocation | 26 January 2026 |
Largest holders of 01638 numbers
| Provider (as allocated by Ofcom) | Share of range | First allocated |
|---|---|---|
| BT | 20% | 15 July 1994 |
| GCI Network Solutions Limited | 2% | 2 May 2017 |
| Virgin Media Limited | 2% | 15 July 1994 |
| Vodafone Ltd (C&W) | 2% | 9 September 2013 |
| (Aq) Limited | 1% | 12 September 2012 |
| AQL Wholesale Ltd | 1% | 1 November 2004 |
86 more providers hold smaller blocks.
Allocation data: Ofcom numbering data, as published 28 October 2026.
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Common Questions About 01638 Numbers
Where is the 01638 area code?
01638 is the dialling code for Newmarket. Numbers starting 01638 are landline numbers for that area. Internet phone services can use them too, so a caller is not necessarily in Newmarket.
Is 01638 a mobile number?
No. 01638 is a landline (geographic) area code for Newmarket. UK mobile numbers start with 07.
Who does the 01638 range belong to?
Ofcom has allocated 01638 numbers to 92 providers. The largest holders are BT, GCI Network Solutions Limited and Virgin Media Limited. 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 01638 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 01638 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.