How to delete the "not assigned" contacts on my phone?

Hi there,



I am new in this forum and have a question, maybe one of you can help me:



My phone Samsung GT-B5510 Android 2.3.6 has in the contacts a group called "not assigned". Instead of phone numbers I have email addresses in there.



I've tried to delete them but unfortunately without...



How to delete the "not assigned" contacts on my phone?



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