This week I received 2 pieces of post from 2 different mobile phone companies addressed to someone one else. My mailing address was used on both. I got suspicious when I received the second one so I opened them. The first was an outstanding bill for ?250. The second was thanking the person for opening a new contract. Is this some sort of scam? Can it some how affect me since my address was used? I'm new to the UK, so not entirely sure how this works.