POP is from the past. It has not been revised since 1998, an eternity in internet years.
Having multiple devices is very common nowadays. POP is not suited for multiple devices. You have to delete the same email on every device that you own.

IMAP on the hand is the solution. Email actions are all synchronized between multiple devices.
It also includes added security encryption coding making your email correspondences much more secure.

Showing you how to switch to IMAP is a part of the multitude of Free Services offered by EckWebSite Hosting and Design.