E.164 phone number converter.
Local formats in, +E.164 out.

The international numbering format defined by the ITU in recommendation E.164: a plus sign, a country code of one to three digits and the national number, with no spaces or punctuation and 15 digits at most. The UK mobile 07400 123456 is +447400123456 in E.164.

Because it is unambiguous: one string means one phone anywhere in the world, while a local format depends on where it is dialled from. The SMSMeteor API takes the destination in E.164 and answers 400 invalid_number to anything else; bulk imports in the panel normalise local formats when the country is known.

No. That 0, the trunk prefix, is only dialled inside the country and is dropped in E.164: 06 12 34 56 78 in France becomes +33612345678. A few countries, Italy among them, have no trunk prefix: their leading digit is part of the number and stays.

Those are international dialling prefixes that stand in for the plus sign: 00 in most of the world, 011 from the United States and Canada, 8 10 from Russia. The converter reads them as + and keeps the rest of the number.

Copy the column, paste it into the converter one number per line and choose the country the local numbers belong to. Numbers already written with + or 00 are detected on their own. Then copy the E.164 numbers or download the CSV and paste it back.

No. It checks the format and the length against each country's numbering plan. Whether a number is assigned and switched on is only known when a message is sent, and the delivery report then says so.

No. The conversion runs in your browser: the numbers are not sent to SMSMeteor, logged or stored.

Short codes, the 4 to 6 digit numbers used for marketing and votes, exist only inside one country. Alphanumeric sender names are not numbers at all. Neither can receive an international SMS.