United Kingdom country code, +44 explained.
Everything you need to call United Kingdom with Twiching — full dialing format, step-by-step guide, and Tier-1 CLI routes that land every call.
United Kingdom
London · Europe
· COUNTRY INFO · VERIFIED
- ISO Alpha-2
- GB
- Capital
- London
- Region
- Europe
- Timezone
- UTC+0 / UTC+1
· DIALING GUIDE · VERIFIED
FULL DIAL FORMAT
011 · +44 · XX · XXXXXXXX
How United Kingdom numbers break down
A complete number to United Kingdom follows this pattern. Twiching adds the exit and country codes automatically when you dial from the app.
EXIT CODE
Dial from the US/Canada to leave the country.
COUNTRY CODE
Routes the call directly into United Kingdom.
AREA / MOBILE
Regional or mobile prefix — drop the leading 0.
LOCAL NUMBER
The subscriber's local number.
COMPLETE NUMBER FORMAT
011 · +44 · XX · XXXXXXXX
United Kingdom on the map
London · Europe
ROUTE
Tier-1 Direct
CLI
Verified
ASR
60%+ min
How to call United Kingdom
Click any step — watch the full dial string build piece by piece.
FULL NUMBER FORMAT
011 · +44 · XX · XXXXXXXX
Twiching automatically adds the exit and country codes — just enter the local number.
United Kingdom —
connected across every carrier.
191
Countries in directory
UNITED KINGDOM INCLUDED
99.97%
Call delivery rate
STIR/SHAKEN
500+
Carrier interconnects
TIER-1 DIRECT
60%+
Guaranteed ASR
REAL-TIME ROUTING
United Kingdom
Europe · GB
United Kingdom numbering plan & how to dial
United Kingdom uses an open numbering plan under country code +44. After the country code, a 2-digit area or mobile prefix is followed by a 8-digit subscriber number, giving a 10-digit national number. Domestic numbers are often written with a leading trunk "0" that is omitted when dialing United Kingdom from abroad.
United Kingdom has 96% internet penetration and is served by 4 major mobile networks (BT, Vodafone, O2, EE). VoIP is permitted and regulated by Ofcom. The local currency is GBP and the primary language is English, which shape IVR prompts, SMS content, and business-hours handling.
Most European numbering plans follow ITU-T E.164 with a national trunk prefix that is dropped for international dialing, and cross-border VoIP is widely supported across the region.
Skipping the exit code
From the US you must dial 011 before the +44 country code to reach United Kingdom.
Keeping the national trunk "0"
That leading 0 on a United Kingdom number is for domestic calls only; leave it out when dialing in after +44.
Ignoring the time difference
Before dialing United Kingdom, check the local clock — it runs on UTC+0 / UTC+1, and off-hours calls tend to go unanswered.
Permitted — Ofcom regulated
Regulated by Ofcom
- CLI presentation rules enforced
- Ofcom Number Portability
- ICO data protection
US → United Kingdom
$0.006/min
per minute
United Kingdom → US
$0.006/min
per minute
More in Europe
Business calling to United Kingdom
Local GB caller ID
Present a United Kingdom +44 number so prospects in London and nationwide recognise the call and are more likely to answer.
Europe outbound & support
Run sales and support lines into United Kingdom over Tier-1 routes that interconnect with networks like BT.
Follow-the-sun coverage
Staff United Kingdom hours (UTC+0 / UTC+1) with routing that sends calls to the right team at the right local time.
FAQ
Calling United Kingdom — frequently asked questions
Yes — since United Kingdom runs on UTC+0 / UTC+1, calls can be routed to the right team based on local business hours there. That's especially useful for support or sales teams covering multiple countries across different time zones from one platform.
BT is among the largest networks in United Kingdom, and Twiching interconnects directly with it for Tier-1 delivery. Direct interconnects like this are what keep call quality and answer rates consistent instead of relying on lower-tier transit.
United Kingdom has 96% internet penetration, which is a useful signal for how reliably VoIP and SMS-based channels will perform there. Higher penetration generally means more consistent call quality and app-based delivery for messaging.
The US exit code is 011 for any international call, including to United Kingdom. It comes right before the +44 country code, and Twiching adds both automatically when you dial from the app, so you only need to enter the local number.
United Kingdom's ISO 3166-1 alpha-2 code is GB, distinct from its dialing code (+44). The ISO code is used in things like domain names and shipping forms, while the dialing code is what actually routes a phone call.
4 major networks serve United Kingdom: BT, Vodafone, O2, EE. Twiching interconnects directly with these carriers over Tier-1 routes rather than relying on third-party transit.
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