Texts failing to send

[Kuribo]

SMS saying failed to send, tap to retry, on Galaxy S9+, happens with almost every other message, however recipient will have received as they often reply before I get chance to resend. Checked and I have correct service centre number and service checker says here is good, no issues. I get same problem with Samsung SMS app, Google's and Textra. I have tried clearing caches and do regular restarts. Anyone have any ideas? Thanks.

[MI5 · Accepted solution]

@Kuribo 

I'd pop into your local O2 shop and get a free sim swap as a starting point.

Some other tips here https://community.o2.co.uk/t5/How-to-Guides/Text-Message-Tips-not-sent-or-received/bc-p/1180495

[Kuribo]

Thanks MI5, what I forgot to mention is that when I press resend the messages go through instantly.

[MI5]

I'd still try a new sim first.
Rule that out before we go deeper.
If not that, it could be an account provisioning problem, but a new sim is easier to try first before battling with O2 to get account re-provisioned.

[Kuribo]

So I've got a new SIM today, mobile web is working as are texts and I have better signal in my house strangely, I can't call anyone yet, says activation can take 24hours.

[MI5]

Keep rebooting every half hour.
It shouldn't take long for all services to come online.

[Kuribo]

Oh and 4G not working just H+

[MI5]

Give it time....

[Marjo]

Hey @Kuribo , just wanted to check how you're getting on with this since you last posted?

Cheers for the troubleshooting @MI5! 

[Kuribo]

Hi, thanks, all functionality returned late last night. I haven't had any messages fail so far but one did get delivered to someone twice for some reason. Thanks for all the help @MI5