Iphone 5s having trouble making an outbound call sometimes?

For about 2 months, I will occasionally have trouble making an outbound call with my iphone 5s. When this happens, I will call someone, and it doesn't have a ring tone or the 0:00 count on it, so basically, it doesn't connect to the caller but it looks like its about to. It will just stay like that until I hang up. I have no idea if the other person is getting a ring. So I hang up, try again, and usually on about the 3rd attempt, the call will connect and go through, I will start hearing the ring tone and the clock will start counting.

How do I fix this?

Added (1). It doesn't happen all the time, maybe every 3 calls I make

Could possibly try to reset network settings and see if helps

That sounds like a service issue, not hardware. Contact your carrier to see if they have any issues in your area.

Upgrade, the 5S Is obsolete