Looking on the internet deeply has found these results:

You asked me to give you a call once I was free is the most popular phrase on the web.

You asked me to give you a call once I'm free 116,800,000 results on the web	You asked me to give you a call once I was free 1173,000,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
You asked me to give you a little space, Jeff. You asked me to give you data, to tell you when we were running the experiment. he asked me to give you a call. I'll be right there. A woman down at the rec center, Rachel, asked me to give you a call. WALTER: He... He asked me to give you something. Manny's on his way, asked me to give you a call. You asked me to give you the figures for the other countries. She asked me to give her a call, but I'm taken.	You asked me to give you the figures for the other countries. A woman down at the rec center, Rachel, asked me to give you a call. WALTER: He... He asked me to give you something. She asked me to give her a call, but I'm taken. You asked me to give you a little space, Jeff. Manny's on his way, asked me to give you a call. he asked me to give you a call. I'll be right there. You asked me to give you data, to tell you when we were running the experiment.

You asked me to give you a call once I'm free

116,800,000 results on the web

You asked me to give you a call once I was free

1173,000,000 results on the web

More popular!

You asked me to give you a little space, Jeff.
You asked me to give you data, to tell you when we were running the experiment.
he asked me to give you a call. I'll be right there.
A woman down at the rec center, Rachel, asked me to give you a call.
WALTER: He... He asked me to give you something.
Manny's on his way, asked me to give you a call.
You asked me to give you the figures for the other countries.
She asked me to give her a call, but I'm taken.

You asked me to give you the figures for the other countries.
A woman down at the rec center, Rachel, asked me to give you a call.
WALTER: He... He asked me to give you something.
She asked me to give her a call, but I'm taken.
You asked me to give you a little space, Jeff.
Manny's on his way, asked me to give you a call.
he asked me to give you a call. I'll be right there.
You asked me to give you data, to tell you when we were running the experiment.