The correct format of the phone numbers within the audience file in any of the models used will be.
Country code to which the mobile number belongs, Area code followed by the mobile number to which we will send the message.
For example in Argentina the country code is 54 9
If the mobile number to send the message to is 1160058974 We will have to load the data as follows 5491160058974
The digits go all together, without space or special characters.
Remember that each country or region has its specific code and if there are particularities in any destination, you must consider them.
For example, in Mexico the code may or may not have 1, being its area code 52.
If the cell phone number where we will send the message was 555581473733.
We must load the data as follows 5215581473733 or 525581473733.