I've changed phone but I've still got my old number
I had a iPhone 4 and backed up on the computer, now I've got a 5s which then I syncend and got all my stuff but when I text someone my old number comes up
iPhone 5s, iOS 8.3
What do you mean with old number? Your phonenumber is related to your simcard. If you put your old simcard from your provider in your new phone you will keep the same number.