To what extent are there people who change their cell phone or laptop twice a year to buy the latest devices?

To what extent are there people who change their cell phone or laptop twice a year to buy the latest devices?

Very few will change every 6 months, especially since something new only comes out once a year.

On average this will be more likely every 2-4 years

There are sure to be.

Personally, they seem to have a very low self-esteem when they become so dependent on material things.