some people can call me, some cant

i had lg g2x with a standard sim with tmobile legacy pay as you go plan. i manually cut the sim to a micro sim so it can fit either to a nexus 5 or a xperia c6606. it didnt work. so i transfered the number and plan to a sim from a tmobile store. now only some people can call me, and some cant. it goes to vocie mail for the people who cant. in order for them to call me, i have to call them first. ive contact custoemr service multiple times and had multiple engineers work on this problem and i still have the problem.

 

so i transfered the number and plan to a sim from a tmobile store. please read