Thank you, that was helpful in letting me know it wasn't a Skype problem.
........
For the record - in case someone else runs into this problem this might be helpful.
After checking every possible setting on the phone, tablet, computer and checking the WiFi settings I'm pretty sure I found the culprit.
In Skype>settings>calling>caller ID> it was ON. I'm thinking I had turned it on a while back when registering a website or verify something.
So
Turned caller ID off, tried 3 numbers, it worked.
Turned it back on (I like to test out things to make sure...555) called same numbers wouldn't work. Ok, this is the problem.
Turned called ID off, tried the 3 numbers it didn't work... damn.
Turned tablet off, back on, called the numbers and it works... so does the phone and computer.
I'm thinking Skype was seeing it was coming from a Thai phone number ?? (not sure why that affected the tablet/computer).
I want to confirm you are using the Free version/service of calling Toll Free numbers abroad.
IF you would, please check to see if your Caller ID is OFF or ON.