What could possibily be the problem to his cell phone?

Question

When i was texting him, he did receive my first & second msg and i did reply him again but after about a while he text me ''Why i didnt reply his text? But i did text him. After half and hour later he text me again asking ' why i did not reply his text? I send another text to him and he text me the same sentence again. I call him many times but pop up state ' number busy'?? After that, I use my cell phone to call&text my friends to check whelther if there are problems with my cell phone. My cell phone is in good condition. We both live in local. Need some help?

Answer 1

Following Reasons May be

>>Network Problem

>>Low Balance

If this is not reason call Customer support