01890 Area Code
The dialling code for Coldstream: what 01890 numbers are, who holds them, and what to do about a call you don't recognise.
What Is the 01890 Area Code?
Coldstream landline number. 01890 is the dialling code for Coldstream. Numbers starting 01890 are landline numbers for that area. Internet phone services can use them too, so a caller is not necessarily in Coldstream.
Who was the range allocated to?
Ofcom has allocated 01890 numbers to 79 providers. The largest holders are BT, Flextel Limited and Magrathea Telecommunications 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 01890 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 01890 Range
| Number type | Coldstream landline number |
|---|---|
| Area | Coldstream |
| Number format | 01890 XXXXXX |
| Allocated by Ofcom | 34% of the range, to 79 providers |
| First allocation on record | 15 July 1994 |
| Most recent allocation | 26 January 2026 |
Largest holders of 01890 numbers
| Provider (as allocated by Ofcom) | Share of range | First allocated |
|---|---|---|
| BT | 13% | 15 July 1994 |
| Flextel Limited | 2% | 21 October 2005 |
| Magrathea Telecommunications Limited | 2% | 24 September 2004 |
| TTNC Limited | 2% | 13 November 2013 |
| TelNG Limited | 2% | 1 March 2007 |
| Gamma Telecom Holdings Limited | under 1% | 14 May 2009 |
73 more providers hold smaller blocks.
Allocation data: Ofcom numbering data, as published 28 October 2026.
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Common Questions About 01890 Numbers
Where is the 01890 area code?
01890 is the dialling code for Coldstream. Numbers starting 01890 are landline numbers for that area. Internet phone services can use them too, so a caller is not necessarily in Coldstream.
Is 01890 a mobile number?
No. 01890 is a landline (geographic) area code for Coldstream. UK mobile numbers start with 07.
Who does the 01890 range belong to?
Ofcom has allocated 01890 numbers to 79 providers. The largest holders are BT, Flextel Limited and Magrathea Telecommunications 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 01890 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 01890 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.