SightMill: format for mobile phone numbers for SMS NPS surveys?

What is the format for mobile phone numbers for SMS surveys?

When uploading your contact data list ready to send out SMS surveys, please make sure that your mobile phone numbers are in the standard international format:

+country-prefix  phone number (without the leading 0)

eg if the contact number is in the UK as 0774 123456, the standard format required starts with country code +44 so the correct format is +44774123456

eg if the contact number is in the USA as 312 123 4567, the standard format required starts with country code +1 so is +13121234567


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