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Can't send SMS to non-added contacts but can once added

Crx
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Hi,

 

As per the title - if I try and send an SMS to a number not on my contact list, the SMS will say "error - could not send." However, if I add the number to my contact list, the message then goes through. Any idea how I can fix this? Handset is a Sony Xperia 10 III

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pgn
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See if some of the tips in here help, @Crx - dial-assist is often the issue, but it can be the app itself that needs an uninstall and reinstall.

https://community.o2.co.uk/t5/Pay-Monthly/O2-open/m-p/1711852/highlight/true#M274044

Good luck!

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MI5
Level 94: Supreme
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@Crx 

We have a Sony expert who may be able to help if this is an issue unique to Sony's.

@viridis any ideas?

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:
Pixel 7a (O2 & Lyca), One Plus 6 (Sfr), iPhone 12 Pro Max (Vodafone)
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Crx
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Hi, where do I edit Dial Assist?

 

Also I don't see Google Message installed on my phone (per the link you provided's recommended fix), I just have the default SMS messaging app. Or do I uninstall Google Message Updates from somewhere else?

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pgn
Level 75: Digital Don
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The actual post I referred to is at the end of the guide, this link may take you directly to it, @Crx 

https://community.o2.co.uk/t5/blogs/blogarticleprintpage/blog-id/How-To-Guides/article-id/1767/comme...

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