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.
Telephony Architecture & Carrier Allocations
A2P Messaging Regulations & Firewall Policies
Not applicable. UK operates under Ofcom General Conditions and Mobile UK cross-carrier code of practice.
Fully supported up to 11 alphanumeric characters. Requires carrier sender ID pre-registration to prevent brand spoofing on bank/fintech traffic.
Supported via virtual mobile numbers (VMNs) in the 07xxx range. Alphanumeric sender IDs are one-way only.
GSM-7 standard (160 chars) and UCS-2 (70 chars). Full pound symbol (£) support in GSM-7 extension table.
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.
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.