Enter Restriction Code problem for nokia cellphone

When you turn on your nokia cellphone, and it displayed "enter restriction code"
Here is tips to repair nokia cellphone for "restriction code" problem

1. Check cellphone for water damage, clean cellphone if needed
2. Contact your service provider and ask the unlock code, if you've been a customer, they should give you the code for free
3. If the problem not solved, Check your imei by pressing *#06#, if it displayed ??????????????, you need to rebuilt imei, rebuilt imei need repair tool box (like JAF, Ufs3 etc)
4. If it displayed number , or your imei number displayed normall, you need to open sim lock ( open simlock need repair tool box )
5. If the problem not solved you may try this code for unlock