How to insert security module into Nokia 3110c?

Question

I can't run any net application on my Nokia 3110c because it asks to **Insert Security code first.

Answer 1

The default security code for Nokia phones is 12345. There is no other hidden or unknown code. This one is used for all the Nokia phones that are not smart. Enter the code one time and check the status. If it says invalid, then you might have changed it and forgot about it. Now, the only thing it remains is that you take the phone to a local Nokia Care shop and they will unlock it for you.