Today I finally got Telenor back on the Operator. So now everything seems good, but still no SMS goes through.
PS. I changed AT+COPS=0,0,"Telenor".
Update:
I've given up on this product.
The Arduino staff member I was speaking to has stopped responding to my emails (6 months ago?), and I have no solution.
I bought a SMS Hat for a raspberry pi and I use that now instead.
https://www.waveshare.com/wiki/SIM7600G-H-M2_4G_HAT (Tutorial link)
https://core-electronics.com.au/guides/raspberry-pi-4g-gps-hat/ (Store/tutorial link [AUS retailer])
https://core-electronics.com.au/sim7600g-h-m2-4g-hat-for-raspberry-pi-lte-cat4-high-speed-4g3g2g-gnss-global-band-1.html (Store link [AUS retailer])
I'm working through just communicating AT commands though the serial ports (UART) with an Arduino UNO. I have no issues sending or receiving SMS with this new product.
Astoundingly, a year later and Arduino still has not fixed this issue. SMS sent to the board will only show when the board is first powered up. Subsequent messages don't show until the board is powered off and back on. It is a problem in the library, I think an index issue, but could be wrong. For a real programmer it would probably be less that a day or two to solve, but it seems that Arduino does not care that they are sending out a board that even their own example sketches do not work for....sigh
Unfortunately Mkr1500 is not working with ublox modem. Ublox is not gives a good support. All things are true , it's connecting the network good but sms is not running. I'm using m-center v.02.07.00.A tool. No sketch no code all operations done by AT commands but it's not running properly... 
and ı have bought 20 piece for my project. Deadline time is coming...
Yes, it is very frustrating. I first tried sending SMS with a Soracom SIM after a week of trying I found out they do not support sending SMS. I then tried a Hologram.io SIM they said they do support outbound SMS. It worked great! I can send outbound SMS easily with the demo program.
Inbound SMS is another story. You have to have a phone number to receive them. Hologram will give you one for a monthly fee. Hologram also has a "dashboard" where they allow you to send TCP, UDP, and SMS "inbound" for testing/developing. However I have not been able to receive an SMS using the read SMS demo program. Nothing happens. Lots of work ahead to try and solve that one. U-blox told me that they had a bug with not receiving the second or more SMS's unless you send one first and someone had mentioned above. So it may not be a library issue. I hope there is a work around as receiving SMS would solve a lot of things I want to do with the MKR NB 1500. I currently have a suppport ticket in with U-blox about this. Maybe I will learn something when they respond. Just wanted you to know you weren't alone. Arduino has also told me that they are aware of the SMS problem but won't do anything about it.
It's too bad situation. I have a project about this. Unfortunately I had to change to project. It's not sending sms just saving data to SD card.
I also had problems sending SMS. The solution for me was finding out the phone number format correctly. Here in the US we normally enter a 10 digit number in our phone to make a call. This did not work. I found that I had to put "+1" at the beginning of the phone number, then it worked!
not work: 2225553456 Worked: +12225553456
Probably different in every country, but this worked for me.
If only I could receive SMS my project would work great.
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