Windows 10 will reach the end of support on October 14th 2025.
Your PC will continue to work but technical assistance, feature and security updates and fixes for Windows 10 will no longer be provided. 
Options for staying supported:
– install Windows 11 on your current PC if it meets the minimum system requirements (to check select ‘Settings > Privacy & Security > Windows Update’)
– buy a new PC with Windows 11 preinstalled 

NZ telcos Two Degrees and One NZ will turn off 3G by the end of this year. Spark will turn off 3G by the end of March 2026.
To check if your phone is 4G/5G compatible go to:
Android – Settings > Network & Internet > Preferred network type (or Network Mode)
Apple – Settings > Mobile > Mobile Data Options