Looking on the internet deeply has found these results:

tell me when you're free is the most popular phrase on the web.

tell me when you're available 130,000 results on the web	tell me when you're free 1132,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
It doesn't look like this phrase is very popular! The search could not find any examples on the internet.	Tell me you're free, because Peter called in a favor and got us a table at the Greene Tavern. I may be overstepping... feel free to tell me to shut up... but I don't think Lucy needs you to be her friend right now. Just tell me when you're free, I'm up for it anytime. You tell me, free dues. Feel free to tell me what that is at any time. And yet here you are, free to tell me all about it. But feel free to tell me anyway. Then just tell me why the free clinic called, and I'll leave you alone.

tell me when you're available

130,000 results on the web

tell me when you're free

1132,000 results on the web

More popular!

It doesn't look like this phrase is very popular! The search could not find any examples on the internet.

Tell me you're free, because Peter called in a favor and got us a table at the Greene Tavern.
I may be overstepping... feel free to tell me to shut up... but I don't think Lucy needs you to be her friend right now.
Just tell me when you're free, I'm up for it anytime.
You tell me, free dues.
Feel free to tell me what that is at any time.
And yet here you are, free to tell me all about it.
But feel free to tell me anyway.
Then just tell me why the free clinic called, and I'll leave you alone.