Give somebody a ring
Definition 1 of 1
Pro Tip 1/3Informal Use
Best used among friends or family rather than in professional settings. 
Let's catch up soon. I'll give you a ring this weekend!
Pro Tip 2/3Not Literal
Doesn't mean to give an actual ring; it's just a way of saying 'to call'. 
You forgot your coat, so give me a ring when you want to pick it up.
Pro Tip 3/3Implies Future
Suggests that the call will happen at a later time, not immediately. 
Once you've made your decision, give me a ring.