"Your SIM sent a text message"

Just decided to update to latest and got this... Kind of cryptic. At&t here too, 6+

Solution, Maybe:

Called AT&T and described the "Your SIM Sent a Text Message" issue. Here are the steps that they had me do.

1. Call AT&T

2. From Settings choose Messages and turn on iMessages, Send as SMS

(Commentary: not sure why, but doing as told)

3. From Settings, General, Reset choose towards the bottom Reset Network Settings

4. Then make sure that you ask (NOT kidding) that they (AT&T) send "The Three Strongest Signals" they can!

(Commentary: Sounds like times of lore to me, but who am I to judge)

That's it! Seems to be working, will come back if it fails again. Good luck.

I got this on my 6 on AT&T. If you go to your Settings -> General -> About and just stay on that page for a moment, it'll ask for a carrier update. Complete that and you'll never have the message again. At least I didn't.

I noticed that "Carrier" went from AT&T 19.0 to 19.1.

Just fell from bed to hardwood floor (with apple leather case) and popped up for the first time in 8 years of current model iPhone usage.

It sounds like something that is usually done without prompting the user. The phone probably notifies carrier that "hey, here is a phone with this model and firmware version, do you have an update?" which is sent as an SMS (short and sweet data transfer protocol).

Regardless, what's creepy and no one gives a hoot about, is the level of access a private company has to the bowel of your device. Thats how AT&T blocks or unblock feature on our phones (like tethering). They just send an "update" to the phone.

Its a shame that user has less access to the phone than a third party company. Touch ID security my ... .

I've been experiencing the same thing and i have cricket. It does this nonstop.