iPhone failing to recieve some calls ...

Hi there,

Even though I may have signal, some calls coming in to my iPhone go straight to voicemail without even trying to ring. Sometimes they get through, sometimes they dont.

It's somewhat getting on my nerves.

My carrier is Orange, and making calls/composing texts/everything else works fine.
Except for call forwarding, which wont work. That is also rather annoying.

Any solutions?

Thanks in advance,
CJ

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