all incoming calls showing as Unknown

[FB65]

in the last week, all my incoming calls are showing as Unknown even if they are in my contacts

[BandOfBrothers]

Have you tried the Resets ->

On the iPhone hold down the Sleep/Wake Button and Home button together until the Apple Logo shows. Then On seeing this Apple Logo release both buttons ,and the iPhone will reset , which has been known to clear most glitches.

Settings -> General-> Reset -> Reset Network Settings.

I see you have posted in https://forum.vodafone.co.uk/t5/Apple-iPhone-6S-and-6S-Plus/Everytime-i-get-a-call-its-unknown/td-p/... too. 

I hope this is resolved for you ASAP. 

[kids]

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@FB65 wrote:

in the last week, all my incoming calls are showing as Unknown even if they are in my contacts

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Post 19 in this thread suggests that you contact customer service to try and resolve the problem.
http://forum.vodafone.co.uk/t5/Apple-iPhone-6S-and-6S-Plus/Unknown-Caller-displayed-for-every-incomi...

[FB65]

Surprisingly it seems to be working now. I did a hard reset it n phone this morning. Not sure if that was what it needed until I read the thread but it's working now thanks

[BandOfBrothers]

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@FB65 wrote:
Surprisingly it seems to be working now. I did a hard reset it n phone this morning. Not sure if that was what it needed until I read the thread but it's working now thanks

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Glad the suggestion helped. 

It does seem to have helped others too and unfortunately not all affected.