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Help! Calls not always coming through

Christielou25
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My phone for a couple of years will pick and choose when to let calls through to my phone. It will not even ring sometimes and forward my calls to my sisters phone. However phone call forward setting won't load and instead I get this error message. " failed to read data. Check sim or network connection then try again". So I can't alter anything figure out why it's doing it etc... any ideas? First problem why is my phone not ringing and diverting calls when I have signal, then secondly why can't I alter my call forwarding settings. 

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MI5
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@Christielou25 

Try dialling ##002# which will delete all call diverts.

I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion. This is not Customer Service so we are unable to help with account specific issues.

Currently using:
OnePlus 6 (O2 & Sfr), Z3 Tablet (Three UK), iPhone 8+ (EE)
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RafaC
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Hey @Christielou25 did you manage to sort this one out?

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sailaway
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Hello. i am also having this issue. 

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