Hop on the Bandwagon

Meaning:
To become involved in an activity that has gained popularity recently.

Example:
I am going to hop on the bandwagon and upgrade my phone to a smart phone.

Did you know?
Circuses used to parade around town on a bandwagon to publicise their shows. Later on, politicians caught on this way of campaigning.

Reference: http://www.idioms4you.com/complete-idioms/hop-on-the-bandwagon.html