hi there, can anybody help me i have recently recieved a nokia 5200 on the tesco mobile network love the phone but want to put an orange sim card into it but according to the person i got the phone off they said it can't be opened to any network just the tesco network, is this true?? i don't mind having to pay to open but just need to know whether this can be done or not!! thanks to anybody who can help me here. i can be e mailed at bubbly74@hotmail.co.uk anytime thanks again