Last line no longer available

This is a documented problem with the iPhone Xs (see the links below). It occurs randomly, after you make a phone call. The next call you make gives you the message (below). It's been posted for months. Apparently, the only "solution" is to delete your entire recent calls list. That's not a solution, that's a BAD work-around. And it can recur.

When is Apple going to do something about it? Can we hear from Apple on this?

https://discussions.apple.com/search?q=last+line+no+longer+available

https://www.reddit.com/r/iOS12/comments/9ibk6l/ios_121_last_line_no_longer_available/

Thanks for the brain cycles on this.

• No dual carrier display in Control Center
• In settings, yes there is Add Cellular Plan. When I select it, I'm supposed to scan a QR code or manually enter in activation info from my 2nd carrier (those fields are all empty, but the option exists)
• I'm the original owner of the phone, purchased, 4 weeks ago from Apple.
• My only twist on the ball is that I purchased this phone in Toronto, but I activated it for my US Verizon account. I've done this with every phone I've owned in the past.

It's just an irritation, not an obstacle, but I'm extra irritated when I look online and see how many people have had this problem since the phone came out and it's been months and no fix. How do we get Apple's engagement - and a fix - on this?

• None of my previous phones have been dual SIM capable (in fact, I've been watching N American dual SIM phones for years; pretty lame, compared to what's been available in the Asian markets. When it works well, it would be the perfect solution to my 2 countries, 2 suppliers, 2 phones problem. Perhaps the XS is my dual SIM solution - TBD)
• I don't think the problem is the purchase in Toronto. Look at how many other people are having this problem. None of the postings I saw even mentioned that they were using this as a dual SIM phone - and nobody even knew what the error message referred to (Me too! Thanks for the education!)
• The phone was new, from Apple, with no association with any carrier (was never locked to a carrier, therefore never unlocked). Been buying my phones that way for years. Greater expense, but greater flexibility during those years when unlocking was a problem. Now I buy phones direct from Apple because they have better maintenance plans (the "Stop giving me excuses, just fix it" plan)
• Thanks for the Apple link. I'll post my question there.
• Ready appreciate your time and knowledge!

Thanks for the insight. I'm not using the XS as a dual SIM card phone (although I do have 2 phones with 2 providers - could be in my future if it works properly!)

Any idea what this means in a 1 SIM context??

Agreed, I have no clue what the message refers to. Have had iphones 4, 5, 5s, 6, 6S, and Xs. Never saw it before Xs (owned it 3 weeks)