Hey, yungbakdam! I totally understand wanting to stay in touch with your friend while they're traveling -- and especially to know how much it could cost each of you! I just have a few quick questions!
What account type -- prepaid, postpaid, no credit -- do you and your friend have? What rate plan are you each on? Where in SE Asia are they located? And am I right in understanding that you're in the US and want to know what the potential cost could be for each of you if you message/call one another?
Just wanted to check in on the questions Marissa asked above!
The best way from overseas, make a call and received call from WIFI CALLING. It is free.
Texting send and receive is free.