Hi, I bought the tablet sometime last year and used it for a short while for internet use. I have switched it on today as I want to use it as a phone. I dial the number, there's a tone, the word "dialling" shows, but it stops and says something about call forwarding on conditional. I don't know how I went about it now, but eventually I did something, re-dialled and the same thing happened only without the comment about call forwarding. How can I make a call?