Today is the last day of 3G support from the local providers. The new platform is 4G or higher.

Please check your phone settings. To do this:

Go to Settings

Click on About Phone

Then click on Software Info

In that list find Baseband Version. This will tell you what bandwith version your phone is running. If it begins with 3.0 most likely your phone will not ba compatable with any of the providers new 4G or 5G services and therfore will not allow many normal funtions to operate.

For more details click on the link below:

https://www.latimes.com/business/technology/story/2022-02-02/if-your-phone-car-or-home-alarm-relies-on-3g-you-need-to-prepare-for-a-shutdown