one call away
one call away=一个电话那么远
If you need my help, remember I'm just one call away!
Don't be too sad that I'm moving. I'm just one call away!
(to be) on call
be available to sb
He was available to me morning, noon, and night.
No, she's not available.
I’m your man.
If you need someone to help fix the car,I’m your man.