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Problem with sending text messages

Yikes
Level 1: Joiner
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All Text messages I send say “not delivered”. Most of the time the messages are going through but the recipients are sometimes receiving it from a number that was originally assigned to my phone when I bought it a year or two back. I changed numbers right from the start. This has only been an issue in the last month. How can I fix this as I’m never sure if my texts do actually send?

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MI5
Level 94: Supreme
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@Yikes 

See tips here Guide: Text Message Tips (not sent or received) 

If you have an iPhone, check Settings >Phone >My Number

If android, check RCS settings within messaging app.

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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MI5
Level 94: Supreme
  • 127410 Posts
  • 614 Topics
  • 22123 Solutions
Registered:

@Yikes 

See tips here Guide: Text Message Tips (not sent or received) 

If you have an iPhone, check Settings >Phone >My Number

If android, check RCS settings within messaging app.

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)
Message 2 of 2
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