In the past I usually change phone due to lagging but this
good phone show no sign of slowing or any problems at all after 3 years of heavy usage.

But alas the end is near because I notice both sides of the screen is lifting up slightly and can see a sliver of light from within. It is sign the battery is swelling up and I have to look for a replacement.

There is no more Asus equivalent model so probably look at Samsung.