No need to call you’re telephone man, there is nothing wrong with your line, she is just taking her sweet time to return your call. Women don’t want a man to think they are chasing them or clingy. Most time she’s just going to wait a few hours or a few days. If she doesn’t call you back, give her one more call and if she doesn’t pick up, take the hint and delete her number after a week. Don’t sit around staring at your phone like a fool, because silence is usually its own answer.