Okay kiddo, imagine your toys are like different phone networks. You can play with your toy cars on the carpet and your toy blocks on the table, but they can't go on each other's areas.
Now, imagine that grown-ups use phone networks. They have different networks like Verizon, AT&T, and T-Mobile. These networks are like your toy areas, but for grown-ups to talk and text to each other using their phones.
Sometimes, there are companies called virtual network operators (VNOs). They don't own their own toy area, but they borrow it from other companies that have them. Just like when your friend borrows your toy car to play with, VNOs borrow phone networks so they can offer their own phone services.
These VNOs make deals with other companies to use their networks. They can offer different prices or services to people who want to use their phones. For example, a VNO can buy access to a Verizon network and offer a cheaper phone plan or a plan that includes more data than Verizon's own plans.
So, VNOs are like borrowing someone's toy area to play with their own toys, except they are borrowing phone networks to offer their own phone plans to people.