When abroad using GLOBAL1, for each voice call or SMS message you want to send, you need to add the international dialing prefix to all numbers.

Learn more about international dialing here.

The format for the international prefix looks like this:

(+) (country code) (area code) (phone number).

Example:

+1 (212) XXX XXXX (USA)

+(44) 207 XXX XXXX (UK)

+(65) 8XXX XXXX (Singapore)