To ensure successful delivery, your contacts' mobile numbers must be written in the correct international format.

To change mobile numbers from the domestic format to the correct international format, simply remove the first '0' or '+' of the mobile number and replace it with the relevant international code (e.g. 61 for Australia and 64 for New Zealand).

For a list of country prefixes, see international codes.

Incorrect formatting may result in undelivered messages or a message being sent to an incorrect handset. To convert a contact spreadsheet of mobile numbers that are in their domestic format (e.g. 04), see How to format an Excel document.

Below are some country-specific examples:

Australia

- Country Code: 61

- Number: 9 digits long, excluding the leading '0'

- Example domestic number: 0447973739

- Example international number: 61447973739

India

- Country Code: 91

- Number: 10 digits long, excluding the leading '0'

- Example domestic number: 09000654321

- Example international number: 919000654321

UK

- Country Code: 44

- Number: 10 digits long, excluding the leading '0'

- Example domestic number: 07723654321

- Example international number: 447723654321

US

- Country Code: 1

- Number: 10 digits long, excluding the leading '0' or '+'

- Example domestic number: 2126544321

- Example international number: 12126544321

UAE

- Country Code: 971

- Number: 8 digits long, excluding the leading '0'

- Example domestic number: 047654321

- Example international number: 97147654321

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