Hello Mahdy,
MY PERSONAL EXPERIENCE:
they will contact you by phone for an interview if they were still interested in you they will call out for you perhaps for on campus interview (1-3 days) Then they will let you know that they offered the PhD position or not. I got admission for PhD in Norway denmark and Switzerland and all of them the procedure were quite similiar! I hope they will contact you soon. In my case after admission they also applied for residence permit for me so I think they will support you pretty well for VISA section. Dont worry
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