Range holder
Mainstream Digital Ltd
Mainstream Digital Ltd is listed by Ofcom as the originally-allocated provider for 2 UK number ranges, mostly landline (01/02). Numbers within these blocks may have since been ported to a different carrier.
Mainstream Digital Ltd at a glance
- Number ranges
- 2
- Number types
- Landline (01/02) 2
Source: Ofcom numbering data, re-imported weekly. Each range is counted once.
If a number from Mainstream Digital Ltd's ranges called you
No clear pattern in reports for these numbers yet. If a call worried you:
- 1
Call back on a number you trust
If a caller says they're your bank, HMRC, a courier or a council, hang up and ring the organisation on the number from its website or your statement, never the number that called you. Caller ID can be faked.
- 2
Forward it to 7726
On a mobile, copy the caller's number from your recent calls and text it to 7726 (it spells SPAM). Scam texts can be forwarded to 7726 as they are. It's free, and your network uses the reports to investigate and block numbers.
- 3
Stop sales calls
Register your landline and mobile free with the Telephone Preference Service (0345 070 0707). Legitimate UK marketers must check it; calls should drop within 28 days. It won't stop scammers.
- 4
If you lost money or shared details
Call your bank on the number on your card (or 159 to reach most UK banks safely), then report it to Report Fraud online or on 0300 123 2040. Report Fraud replaced Action Fraud on 4 December 2025 for England, Wales and Northern Ireland; in Scotland call Police Scotland on 101.
All Mainstream Digital Ltd ranges2, by prefix
| Prefix | Status |
|---|---|
| +44 12555 | Allocated |
| +44 12921 | Allocated |
Related lookups
- Mainstream Digital Ltd scam & spam reportsCommunity-reported numbers on this holder's ranges
- 01255 Clacton-on-Sea1 Mainstream Digital Ltd range
- 01292 Ayr1 Mainstream Digital Ltd range
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- How Ofcom numbering worksThe UK numbering plan explained
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Frequently asked questions
What does it mean that Mainstream Digital Ltd is the range holder?
Ofcom allocated the blocks listed on this page to Mainstream Digital Ltd. A number keeps its digits when its user switches provider, so a number in these blocks may now be on another network; Ofcom doesn't publish who a number is on today.
What kinds of numbers does Mainstream Digital Ltd hold?
Of its 2 allocated ranges: 2 landline (01/02).
Which area codes does Mainstream Digital Ltd have most numbers in?
By allocated blocks: 01255 Clacton-on-Sea (1), 01292 Ayr (1).
How often is the Mainstream Digital Ltd list updated?
Ofcom publishes its numbering data every Wednesday and this page is rebuilt from it weekly, so new Mainstream Digital Ltd blocks appear within about a week.