When You parchase a new cell phone in tha market,the company sold you phone LOCKED ,so you can only use it on their network.s o you cant use mobile without sim.this means you cant use your phone on any other network,now we find a amzing things solve this problem,there services that offer to provide unlocking capabalities for a free.
Plz Follow Some steps
1Steps Bofore you do anything ,contact Your service Provider and ask for an Unlock code.or call customer care number of nokia company.they provide you unlock code for free.this is a best way to find your problem.
2Steps Download Software to generate Unlocking code,there are lots of Software available in market
3Steps Find the serial number on your mobile .dial*#06# find Serail number,using Serial number you find unlock code easily
4Steps using software you hav downloaded ,either enter you contray and the network,calculate this code ,this may be different depending on which software you are using.
Ex if you you use nokia3390 Phone,
5Steps. First you Remove the SIM card from your Nokia phone. This is typically done by removing the back cover of the phone and removing the battery and sliding the card out. Put the battery back in and power the phone on.
6Steps. You will see a message "Insert SIM Card". Enter all of the characters you see in your code, including the # symbols. To get a 'p' press * 3 times, to get a '+' press the * key 2 times, to get a 'w' press the * key 4 times. Disregard any spaces in the code.
* Unlocking only applies to GSM phones, phones using other cellular technologies, first cannot be unlocked without special software and hardware.
* Switch off the phone. Hold the keys "3", "*" and "Call" and switch the phone on. Keep the buttons held down till you see the word "Formatting..." on the screen. Make sure that the battery is full charged before you attempt this. This should reset the phone lock code.