I live in Ghana and use an iPhone 4S with the local Vodafone network. My problem is when I receive a text message it does not come in the name of the contact in the phone but rather with the telephone number with the country code. I am thereforee unable to figure out the name of the sender. In other words, the phone keeps the outgoing text messages in the name of the contact and incoming messages the number. How do I solve the problem?