My daughter as moved to austrailia and she put a lebara sim card in her phone that used to be contracted it works nut is not giving her the correct credits it should do does she need to change the jav

SOURCE: SIM card registration failed

You might have filled up the memory to the brim and the phone doesn't have enough to switch on.
Try reformat to original settings. anything you stored on the phone will be lost.

How to reformat your phone, first turn it OFF. Press * 3 send at the same time and keep them pressed while you turn the phone on.
Give it time to work.

Remember, do not let go the 3 keys until you see the formatting screen.
After a few minutes when the process is over, your Nokia N70 will be back to the original delivered system.

SOURCE: unlock prepaid pantech c120 to use SIM card from contract phone

That sounds like a feature to me. I suggest you use that to your advantage and put in some prank calls.

SOURCE: SIM card registration failed

i have the sme problem

SOURCE: sim card not working sim works in other phone

The first thing you can do if you think there is aproblem with the phone settings is that :
Go into network setings of the phone and choose MANUAL in the Network selection. Then you can search for the Lebara network manually and select it, if it works.
Or if it doesnt work, then the phone probably might have been locked. Just check it once, using any other network simcards it your phone. If it is locked, you can easily get it unlocked in your local market.

SOURCE: how to fix an invalid sim card

try a different sim card if that doesent work then it might be the phone