You can use the account method to retrieve the account information for the current user. The response includes the mobile phone number for users who log on using their mobile phone number.
Examples
Code Sample
cloud.account({
success: function(success) {
//the account call will return a user id you can use to reference a user
var userId = success.body.id;
var bytesUsed = success.body.usage.quotaUsed;
var bytesAllowed = success.body.usage.quota;
}
});