The 01638 area code: Newmarket
01638 is the UK dialling code for Newmarket. It is a geographic landline code, so calling it costs the same as any other UK landline number and is usually included in call allowances.
Built from Ofcom numbering data, last refreshed 2026-07-24.
01638 at a glance
- Area
- Newmarket
- Number format
- (01638) XXX XXX, usually 6-digit local numbers
- Calling from abroad
- +44 1638 then the local number, dropping the first 0
- Call cost
- Standard UK landline rate, usually included in call allowances
Getting calls from a 01638 number?
01638 is a legitimate geographic code, so most calls from it are ordinary: local businesses, surgeries, schools, councils and households in the Newmarket area. Two things are worth knowing before you call back.
First, caller display can be faked. Scammers spoof real UK area codes to look local, so a 01638 number on your screen is not proof the call came from Newmarket. Second, the safe habit is simple: if a caller you were not expecting asks for personal or payment details, hang up and ring the organisation back on a number you found independently.
Checking a full number rather than just the code? Try our free UK phone number checker, which identifies the area and original provider of any UK number from Ofcom data.
Who issues 01638 numbers?
Ofcom allocates 01638 numbers to communications providers in blocks. These providers currently hold the most number blocks in the Newmarket area:
- BT - 23 number blocks
- GCI Network Solutions Limited - 11 number blocks
- Sky UK Limited - 8 number blocks
- Vodafone Ltd (C&W) - 7 number blocks
- TalkTalk Communications Limited - 4 number blocks
146 blocks allocated in total. The provider a number was first issued to is not necessarily who serves it today, because numbers move between providers when ported.
Get a 01638 number for your business
A Newmarket number makes your business local to the people searching for it, wherever you actually answer the phone. ONSIM supplies 01638 numbers two ways: a virtual number that diverts to any phone from £5 a month, or on a Landline SIM from £10 a month so your mobile rings and dials as the 01638 number, with call recording available for regulated trades.
Already have a 01638 number? You can bring it with you. Porting in is included on Landline SIM plans, or a one-off £20 + VAT on Virtual Landline.
Not sure which number type fits? Two minutes with the business number chooser will tell you.
01638 area code questions
Where is the 01638 area code?
01638 is the dialling code for Newmarket. The code and the areas it serves are set by Ofcom, the UK communications regulator.
How much does it cost to call a 01638 number?
01638 numbers are standard UK geographic landline numbers, charged at the same rate as any other 01 or 02 number. Most mobile and landline tariffs include them in inclusive minutes, so the call usually costs nothing extra. From abroad, dial +44 1638 followed by the local number, charged at your provider's international rate to the UK.
Why am I getting calls from a 01638 number?
Most calls from 01638 numbers are exactly what they look like: a business, GP surgery, school or household in the Newmarket area. But caller display can be faked, a practice called spoofing, so an unexpected call showing 01638 is not proof the caller is really local. If a caller asks for personal or payment details, hang up and call the organisation back on a number you found yourself, for example from its website or a bill.
Can I get a 01638 number for my business?
Yes. You do not need an office in Newmarket or a phone line from the dominant local provider. ONSIM can supply a 01638 number that diverts to any phone from £5 a month, or put it on a business SIM so your mobile makes and receives calls as the 01638 number. Existing 01638 numbers can be ported in: porting is included on Landline SIM plans, or a one-off £20 + VAT on Virtual Landline.