How to Call the UK from the US (Landline, Mobile & +44)

Formula

From the US: 011 (or +) → 44 → UK number without the leading 0.

X characters are placeholders — not a private callable number. Save +44 in contacts; use 011 only for all-digit US access.

Dial it step by step

1. 1

   Exit the US network. On a mobile or modern contact book, start with +. On a US landline, PBX, or digit-only service, dial 011.

2. 2

   Add the UK country calling code: 44.

3. 3

   Add the national significant number (NSN). Take the domestic UK number and remove the leading trunk prefix 0. That 0 is domestic routing under the UK plan; it is not part of the international destination after +44.

Call a UK landline from the US

How do you call a UK landline from the US? Dial the US exit code 011 (or + on a mobile), then the UK country code 44, then the landline's national significant number with the leading trunk 0 removed.

Other cities follow the same rule: drop the domestic 0, keep the area code that remains (Manchester 0161 → +44 161…, Edinburgh 0131 → +44 131…). See the mobile vs landline table and worked city examples below for more patterns.

Call a UK mobile from the US

How do you call a UK mobile from the US? UK mobiles are written domestically as 07…. From the US, drop the leading 0 and dial after 011 44 (or save as +44 7…).

After removing the trunk 0, the national significant number for a typical UK mobile starts with 7 and continues with the remaining subscriber digits. Number portability means a 07 prefix does not permanently identify the carrier. Use the mobile vs landline table for the side-by-side with geographic numbers.

From a US mobile vs a US landline / PBX

The destination digits are the same (44 + UK NSN). Only the origin access changes:

Do not store 011 in the contact. Save +44 + NSN (E.164 / E.123) so the number stays portable when you change networks.

UK toll-free and non-geographic from the US

UK freephone ranges such as 0800 and 0808 are priced and routed for domestic UK use. From the United States they are not free, and some numbers are hard to reach or blocked internationally. Prefer a geographic landline or a UK mobile when calling from abroad, and confirm reachability and charging with your US carrier. No rates are quoted here.

If a number is reachable in international form, freephone is written with country code 44 and without the domestic trunk presentation — for example +44 800… / +44 808… rather than keeping a leading 0 after 44. UK-wide 03 numbers are geographic-style national numbers under the UK plan (still drop the domestic 0 for +44 3…); they are not US toll-free.

More on freephone abroad: international toll-free calling.

Call back: UK → US

Calling the other direction uses the UK exit and the NANP country code:

From the UK: 00 (or +) → 1 → the full 10-digit US number (no trunk 0 to strip). Example pattern: save a US number as +1 NXX NXX XXXX, or dial 00 1 NXX NXX XXXX on a digits-only UK line.

Full walkthrough: Call United States from United Kingdom.

Mobile vs landline

Both patterns drop the UK domestic 0. Only the remaining national digits change.

• Mobile: domestic 07… → international +44 7….
• Geographic landline: domestic 020… (London) → international +44 20….

Same trunk-zero rule across UK geographic codes. See United Kingdom and E.164 format.

Worked city examples

Domestic → portable international → digits-only from the United States. Placeholders only.

Common mistakes on this route

• Keeping the UK domestic 0 after 44. Strings like 011 44 0… or +44 020… are wrong. Correct: 011 44 20… / +44 20….
• Saving 011 in the contact. Store +44 + NSN so the number stays portable. See common formatting errors.
• Assuming UK 0800 is free from the US. Domestic freephone treatment generally does not apply from abroad, and some ranges are hard to reach internationally. Prefer a geographic or mobile number; confirm charging with your carrier. No rates claimed here.

Quick UK area codes (from the US)

International form already has the leading 0 removed. Dial 011 44 (or +44), then the code, then subscriber digits.

Starter set only — not a full inventory. Trunk rules and mobile ranges: United Kingdom (+44).

Time difference (practical)

The UK is typically about five hours ahead of US Eastern (09:00 New York ≈ 14:00 London). Central/Mountain/Pacific offsets are larger. DST schedules differ, so the gap can shift by an hour around transitions — check the current offset before early or late calls.

How the international format is built

Under ITU-T E.164, the international number is country code + national significant number (max 15 digits). Spaces and + are display/access notation, not E.164 digits. ITU-T E.123 uses + to mean “apply this network’s international prefix.”

UK trunk-0 rules follow the Ofcom National Telephone Numbering Plan and the ITU UK national plan listing. Templates and exceptions (including countries that retain a significant leading zero): international dialing format guide.

Related routes and internal links

Guides: E.164 international dialing format · Country dialing walkthroughs · Common formatting errors

Related /call/ pairs

• India from US
• Australia from US
• Germany from US
• UK from Australia
• US from UK

Clone pattern: /call/{destination}-from-{origin}.

FAQ

Country code references