Question Author
Thank you guys. I took the phone back to the shop today. After almost 2 hours..... they told me that nothing was wrong with it! I had nothing still in my inbox and whatever, but it seems that I'd somehow overloaded one particular number I'd been trying in vain to call, and the problem's actually at the receiving end of that person's phone. Some code was plonked in, and my phone was checked by the company. It's now working perfectly!!! Tvm for your help.