Iphone 5s sometimes not making outward calls?

Lately, my iphone has been having some kind of issue with making outbound calls. When I try to call someone, it has no ring tone, its just silent… For minutes until I just give up. It says its calling the person, but on my end it doesn't, I don't know if they are receiving my attempts to call but I don't think so. I do this like 2-3 times before it actually makes the call successfully.

Why is it doing this and how can I fix it?

Outbound calls, the term you're looking for is "outbound calls." Carry on.

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