Thank you for all those details
I have had a look at every conceivable way to unlock the 2 handsets
Sadly this is not something we can actually do for you
The 2 mobile numbers are associated with 2 other handsets
The IMEI Numbers you gave do not bring anything up
Where did you get then from?
The problem is we are looking at 13 year old phones here. Many of the manufacturers will have changed hands. (In the case of Nokia twice) Databases of codes may simply not be available.
Phone unlocking shops may have a way to do this as they use special unofficial unlocking software.
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Hello again Keystone
It might be best to purchase an unlocked handset to use the other Sim in
What @enlli has also advised explains the situation very well