Problems with mobile phone or t-mobile?

I am having some problems with my mobile phone. like sometimes calls dont come through to me and i only know somebody has called me if they leave a voice mail. also, i have to keep re-sending text message and my deli notification comes hours late. is this a problem with t-mobile or my phone?
Answer
Hiya! shine. sounds like a software problem my friend! ring 150 and they will resend the configuaration settings! you will need another phone, for them to talk you through the new setup in your device.