I used an Android application to read the SIM number but I also got it rejected when I applied for the portability.
Thanks a lot for your help.
Beste antwoord door David
How odd that your migration gets rejected this much.. :S
The odd thing is that you should be able to fill in the sim card number which should come to a total of 19 digits, starting with 893126. Since you've already tried this, I think the next step is to get in touch with Lebara. They should have your full sim card number registered in their systems and be able to provide this to you.
I wish I could help a little bit more in this case, but unfortunately we can't figure out your number on our side.. If you have any update or need any assistance, feel free to ask!