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Although I have adequate credit I am unable to make a call from my cell phone why ?
I checked your call logs and it shows that last call went through. There were couple of calls that didn't go through since number was temporary not available. It might happen when number is busy.
If you still have trouble reaching a number and you know it's not busy then could you please provide exact called number/date/time to customer service and they can check with carriers what is the issue.
Customer Service: https://support.skype.com/faq/FA1170
If answer was helpful please mark it with Kudos and if issue is resolved mark it with solution. This will help other users find this answer more easily. Thanks in advance!