Limited service proplem

You can Unlock SAMSUNG SGH F480 model Phone to use other GSM Network Sim cards.Get the Unlock code from here Mobile-unlocker.com/samsung-sgh-f480/rs2wp9/ and Unlock it simply.

There may be some problem with your battery .Try to replace the battery and check whether this problem exist

Well if you are tied to a particular network all you have to do is call up the customer help line of the service provider and ask them for the unlocking code, which will be provided to you for a nominal amount of money.
You can also get the unlock code through online..........i will suggest the website Unlock-Zone.com which is doing good service .....you can approach this website.

Sometimes free codes will generate wrong codes and when tried several times will lock your mobile permanently. You can try to get cheap codes from sites like wickedunlock.com or from your service provider.

Samsung mobiles only have limited capabilities for customization.Only high end models offers custom themes.

It should say Limited Service.

Check the IMEI by pressing *#06# it should be all zeros. o2 does not allow this serial code but you could use any other network with the phone. You cannot fix this because it is illegal to change serial numbers on wireless equipment.

You might want to check if the sim card is in and working. If so, contact your service provider to see what are possible solutions.

Normally, your service needs to be specifically enabled to make video calls (especially if this your first 3G phone and you've just used your SIM card from your old 2G phone). If this is the case ring your providers customer service and they should be able to enable it there and then.
Also, both you and the person you're ringing have to be in a 3G service area (often more limited than the general "voice call" coverage area).

Double check your phone number by calling another mobile and confirming what number comes up on their phone (my sister recently discovered she'd been giving friends the wrong and wondering why they couldn't call her...)!
Then try calling back using the "received calls" list from their phone. If it doesn't work, you'll need to contact your service provider as their is an incorrect setting in their network.

okay its more than likely 0000 or the last digits of the cell number give that a try