Cellular 3G/4G security cameras can work without WiFi. These cameras connect to telecom networks and use the same internet that's on your phone to access the internet, the cloud storage, and transmit data. Many companies offer 4G variants of their WiFi cameras, such as the Reolink Go+. You'll have to buy a subscription to the network provider, however, and their network access does depend on nearby cellular towers.
The only alternative to this is to have hardwired cameras, which will use Ethernet and other cables running across your property into the central computer that monitors the entire system.