Hello {studentfirstname},
My name is (your_name) and I’m a recruiter with (company_name). First, I would like to thank you for applying to the (job_title) position with us.
I would like to inform you that after reviewing your application, we have selected you for the next round, which is a phone interview.
The main purpose of this phone interview is to get to know you better, and for you to ask any questions you may have. 
Are you available for a short phone call? It won’t take longer than (x minutes). 
Here are a few dates I have available.
(Monday, date, time)
(Tuesday, date, time)
(Wednesday, date, time)
If none of these options work for you, please let me know and I will do my best to accommodate to your schedule. 
Please send me a confirmation email with a chosen date and time as well as your phone number. 
I look forward to hearing from you!
Best,
(your_name)
(signature)