How to Make International Calls From a US SIM: Dialing Format and Cost-Saving Guide

2026-11-04

The short version: on a mobile phone, dial + followed by the country code and the number — press and hold 0 to get the +. On a landline, dial 011 first, then the country code and number. Before a long call, check two things: whether the destination is covered by your plan's international minutes, and how it is billed. Confirm exact rates at purchase time.

1. The dialing format: +, 011, and the dropped zero

• Mobile format: + country code, then the area or city code with its leading 0 removed, then the local number. To call a mobile in China: +86 plus the 11-digit mobile number. To call a Beijing landline: +86 10 plus the local number — the 0 in 010 is dropped.
• Landline format: 011 country code area code local number. 011 is the US international exit code; the + on a mobile does the same job and works in any country.
• Exception: Canada and most of the Caribbean share the North American numbering plan with the US, so you dial them like a domestic long-distance call — 1 plus area code plus number, no 011.
• Save numbers in international format. Storing every contact as +country code means the number still works if you change countries or SIM cards, with no reformatting needed.

2. Check the plan before you call

• Some plans include international calling, others cover US domestic calls only and bill international calls separately — per-minute or through an add-on. That gap is the most common cause of a surprise bill.
• Some Lycamobile plans include international calling to many countries, but the covered countries and minute rules vary by plan. T-Mobile and AT&T handle international calling differently again, so confirm your most-called countries with the seller before you buy.
• Occasional calls and daily calls home point to different plans: the first needs a fair per-call charge, the second is better served by a plan with bundled international minutes.

3. Ways to keep the cost down

• A plan with international minutes: the simplest option if you regularly call the same few countries — no per-call math.
• Internet calling apps: when the other person has the same app, the call runs over data or Wi-Fi instead of phone minutes. It only works if both sides have the app installed.
• Wi-Fi Calling: useful abroad or in weak-signal spots for calling US numbers, but it does not make every international destination free — the plan's rules still apply.
• Test with a short call first. When calling a new destination, try a brief call to confirm the format connects and the billing looks right, before settling in for a long conversation.

4. If the call won't go through

• "Number does not exist": usually a leading 0 left in the area code, or a wrong country code. Redial in + format and check the code.
• Call drops immediately: check whether your plan covers that country and whether your minutes or balance are used up, then ask the seller whether international calling needs to be enabled.
• Poor audio: move to better signal or switch to Wi-Fi Calling and retry, to rule out the network before blaming the number format.
• Save frequent contacts in international format and confirm your main destinations with the seller before the trip — then calling home needs no last-minute lookups.