Have you tried to insert other provider's sim in your mobile and because of that is your mobile is showing "contact service provider" if so your mobile is locked to network and you can unlock it to use other proider's SIM..try Unlock-Free to get unlock code for your nokia 6670 and unlock it instantly..
SOURCE: nokia n76
NOKIA SERIES 60
If you ever tried debranding the phone youself and made a pigs ear of it, and your phone says " phone start up failed, contact the retailer" below is a way of reformatting the phone back to the original factory settings.
1 power the phone off,
2 press and keep down the keeys green/talk + '3' + '*', - power on the phone at the same time
3 release the keys when the formatting starts.
SOURCE: nokia n72 phone startup failed
sir my phone is a error
phone startup failed contact retailer
please solution this probliam
SOURCE: phone startup failed Contact the retailer.Nokia
Problem: Nokia 7610 startup failed contact the retailer
Solve: You Need to format your mobile and this is the way
First of all Turn Off Your Mobile Phone
[ format = power + press & hold call + * + 3 ]
SOURCE: My nokia 5530, will not
You can *#7370# to restore your device, but you will loose all your data...
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