How to call to Malaysia and Singapore with U.S. prepaid card

1.How can my friends in Malaysia/Singapore call to my mobile phone with T-Mobile card or AT&T prepaid card? 2.Will it charge the incoming calls in Malaysia or Singapore?

AT&T

1.Can I use AT&T and LTE signal 2.What is the difference between AT&T Go Phone prepaid card, Red Pocket red envelope mobile phone, and Airvoice/h2o prepaid card

About T-Mobile

1.Change T-Mobile plan 2.The expire date of T-Mobile 3.How to surf the Web and set hotspot sharing 4.T-Mobile customer service hotline 5.Check T-Mobile balance account 6.How to refill 7.How fast is the 128kbps or 63 kbps of excess data 8.Can I stop or renewal monthly plan 9.Mobile is unable to surf the Web(T-mobile) 10.How to call to Malaysia or Singapore 11.The limitation of Malaysia/Singapore mobile phone to surf the Web with 3G/4G 12.search the signal of T-mobile 13.Buy 3 month but only use 1 month and receive renewal message 14.Debit way of monthly plan 15.How to set MMS
16.Is any kind of mobile apply T-Mobile 17.Is that normal to get 4G in U.S. 18.Can I use Skype or FaceTime with T-Mobile 3G data 19.Can I change monthly plan 9 when I run out of minutes 20.If I don't run out of 100 minutes of plan 9, can I use in next month 21.Music freedom streaming/Music Unlimited 22.The limitation and frequency of T-Mobile 4G LTE 23.How to set T-mobile APN 24.T-Mobile 15$ international call services