Not sure if other #mobian #pinephone users experienced this, but I have been getting unusual text messages compared to my previous phones. I believe these are either generated by Modem manager or sent by my service provider. In them includes timestamps and my phone #. This leads me to be inclined to believe them to be associated with voicemails being left.

If anyone else has any other ideas, I'm all ears.

@lucifargundam i set up my new android phone and I noticed these style of messages under a weird phone number that has a +44 country code

@MischievousTomato
Is it a pinephone with android or another phone with mobian?

-i was under the impression pine64 was based in UK, but wiki says it's founded in US and made in HK.
https://en.m.wikipedia.org/wiki/Pine64

-mobian shouldn't (iirc) have any default settings that would lead you to get texts from UK. I will have to double-check later though.
https://gitlab.com/mobian1

@lucifargundam nonono, it's a xiaomi, sorry for not mentioning that. I thought I'd mention the thing I experienced because it seems similar to your experience

@MischievousTomato
I suspect that narrows it down to either your phone was originally distributed in UK, your isp is UK based, one of your apps is UK associated or your phone # is on a list somewhere.

Keep in mind I'm not a professional, nor do I pretend to have full certainty or backing supporting this.