How do I call another country from my phone?

Select From (where you are) and To (where the number is), then open Get dialing steps. Follow exit (or +) → country calling code → national number with that destination’s trunk rule. Prefer saving the contact as + plus country code plus national digits so the same entry works when you change networks.

Why do some countries drop a leading zero and Italy keeps it?

A leading 0 is often a domestic trunk prefix and is removed in international format (for example UK 020 → +44 20). Italian geographic numbers treat the leading 0 as part of the national significant number, so Rome 06… becomes +39 06…. Always follow the destination plan, not a global “always drop zero” shortcut.

Should I save 011 or 00 in my contacts?

No. Those digits are origin international access prefixes. Save + and the destination country code. Replace + with 011, 00, 0011, 010, or another documented origin prefix only when the current network requires digits.

What if my From/To pair is not in the list?

Use the reusable country dialing walkthroughs formula, then confirm the destination code and trunk rule on that country’s directory page. New pair walkthroughs are added as static /call/{destination}-from-{origin} pages; this picker does not invent pages for unpublished routes.

Is +1 only the United States?

+1 is the North American Numbering Plan (NANP), shared by the United States, Canada, and multiple Caribbean and Atlantic jurisdictions. The next digits (the area or NPA code) resolve the destination.

Pick origin and destination · step-by-step dial strings

International calling walkthroughs

How do you use this page? Choose the country you are calling from and the country you are calling to, then open the matching walkthrough. Each pair page shows the origin exit (or +), destination calling code, and whether to remove or retain a domestic trunk digit.

Save destinations in portable + format. Replace + with the origin network’s digits-only international access prefix only when required — never store that origin prefix inside the contact.

Choose your route

FromTo

We route you to a static walkthrough for that pair — exit code, country code, and trunk rule.

Need to rewrite a domestic number? Use the private format checker.

Popular dialing routes

Every linked route below is a published static walkthrough. Unpublished picker combinations stay on this page with a “not yet” message.

United States ↔ United Kingdom

From the United States

More reviewed routes

Exit code → country code → trunk rule

1. Exit the origin networkUse + on a mobile or the origin access prefix on an all-digit line: for example 011, 00, Japan 010, or Australia 0011. Do not save it in the contact.
2. Add the destination codeAdd the digits selecting the destination numbering plan, such as 44 for the UK, 1 for the NANP, or 39 for Italy.
3. Apply the destination ruleRemove a domestic trunk 0 where required. Italy is a common exception: geographic numbers retain the leading 0 after +39.

Portable contact form: + country code + national significant number. For worked templates and exceptions, read the country dialing walkthroughs and E.164 international dialing format guides.

International calling FAQ

How do I call another country from my phone?: Select From (where you are) and To (where the number is), then open Get dialing steps. Follow exit (or +) → country calling code → national number with that destination’s trunk rule. Prefer saving the contact as + plus country code plus national digits so the same entry works when you change networks.
Why do some countries drop a leading zero and Italy keeps it?: A leading 0 is often a domestic trunk prefix and is removed in international format (for example UK 020 → +44 20). Italian geographic numbers treat the leading 0 as part of the national significant number, so Rome 06… becomes +39 06…. Always follow the destination plan, not a global “always drop zero” shortcut.
Should I save 011 or 00 in my contacts?: No. Those digits are origin international access prefixes. Save + and the destination country code. Replace + with 011, 00, 0011, 010, or another documented origin prefix only when the current network requires digits.
What if my From/To pair is not in the list?: Use the reusable country dialing walkthroughs formula, then confirm the destination code and trunk rule on that country’s directory page. New pair walkthroughs are added as static /call/{destination}-from-{origin} pages; this picker does not invent pages for unpublished routes.
Is +1 only the United States?: +1 is the North American Numbering Plan (NANP), shared by the United States, Canada, and multiple Caribbean and Atlantic jurisdictions. The next digits (the area or NPA code) resolve the destination.

Browse all calling codes in the international calling code directory, learn the reusable formula in country dialing walkthroughs, or read E.164 format and exit codes.