---
title: "United Kingdom (+44) Country Calling Code & SMS Numbering Plan"
---

United Kingdom (+44) Country Calling Code & SMS Numbering Plan: SMSRiver

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- United Kingdom (+44)

National Telecom Specification

# United Kingdom (+44) Country Calling Code & SMS Guide

Complete engineering reference for phone numbering formats, domestic trunk prefixes, cellular mobile operator allocations, and regulatory A2P SMS requirements in United Kingdom.

Quick Jump:
[Numbering Plan](#numbering-plan)
[A2P Regulations](#sms-regulations)
[Verify GB Number](#inspector-cta)

[Live United Kingdom Inboxes](/receive-sms/gb/)

Country Dialing Code
+44
ISO: GB

Domestic Trunk Prefix
0
Omitted internationally

National Length
10 digits (mobile/geographic) or 9-10 digits
Local subscriber digits

Full E.164 Length
12 digits (+44 7xxx xxxxxx)
With +44 prefix

## Telephony Architecture & Carrier Allocations

Destination Codes:
Geographic 01/02, Mobile 07, Non-Geographic 03/08

Mobile Prefix Patterns:
07xxx (071xx-079xx allocated strictly to cellular radio networks)

Major Mobile Network Operators:
EE, O2 UK (Virgin Media O2), Vodafone UK, Three UK

## A2P Messaging Regulations & Firewall Policies

A2P 10DLC & Campaign Registration
Not applicable. UK operates under Ofcom General Conditions and Mobile UK cross-carrier code of practice.

Alphanumeric Sender ID Support
Fully supported up to 11 alphanumeric characters. Requires carrier sender ID pre-registration to prevent brand spoofing on bank/fintech traffic.

Two-Way Messaging Capability
Supported via virtual mobile numbers (VMNs) in the 07xxx range. Alphanumeric sender IDs are one-way only.

Character Encoding Standards
GSM-7 standard (160 chars) and UCS-2 (70 chars). Full pound symbol (£) support in GSM-7 extension table.

Compliance Framework: UK GDPR and Privacy and Electronic Communications Regulations (PECR); Ofcom numbering plan compliance.

Interactive Number Intelligence

### Test a United Kingdom Number Now

Check if a United Kingdom phone number conforms to the national numbering plan, classify mobile vs VoIP allocation, and obtain canonical E.164 standardization.

Inspect Number →

## Frequently Asked Questions for United Kingdom

### What is the country calling code for the United Kingdom?

The UK international calling code is +44. When calling internationally, drop the domestic trunk prefix 0 (e.g., 07911 becomes +447911).

### Can I use an Alphanumeric Sender ID when sending SMS to the UK?

Yes. UK carriers support dynamic alphanumeric sender IDs up to 11 characters. Sender ID pre-registration is recommended for enterprise and banking traffic.

### How do I recognize a UK mobile phone number?

UK mobile numbers always start with 07 in national format (e.g., 07911 123456) and +447 in E.164 format.

### Related National Calling Codes

[Australia
+61](/country-codes/australia/)

[Austria
+43](/country-codes/austria/)

[Belgium
+32](/country-codes/belgium/)

[Brazil
+55](/country-codes/brazil/)

[Canada
+1](/country-codes/canada/)

[France
+33](/country-codes/france/)

[Germany
+49](/country-codes/germany/)

[India
+91](/country-codes/india/)

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