International calls from Dtac or AIS - best options?

[jpinx]

I need to call USA, UK, NZ and a few other places and I have Dtac and 12Call sims.. What's the best options?

Example - I need to call a USA +1 xxx.... number during weekday working hours in USA east coast.

Edited February 17, 2015 by jpinx

[metisdead]

Moved to the Internet, computers, communicationm technology forum.

[jpinx]

I've got the standard answers from Dtac and AIS --

http://www.dtac.co.th/en/postpaid/services/004.html#Tab2

and...

http://www.ais.co.th/00500/en/

I'm hoping someone has found a better solution to more remote places like USVirgin Islands....

[BB1950]

CAT 009 prefix.