Hi, I got the same call last week. A man called me and said that he was from 3G and was enquiring about some fantastic upgrade offer. I was assuming it was legit as I wounldn't have thought anyone else would have my number but then I heard children shouting and playing in the background and immediately knew that this was someone working from home and alarm bells started ringing. He asked how long I had the contract for and although I had about 4 months left, I said it was new and had 9 months left. He said he will call back sooner that time.