Which one?

i'm in a dilemma.
Over which hp to get.
My contract with Xingtel expired long time.
Discovered that 原来 Mdc has cooperate rate with Xingtel.
So that gives me the opportunity to renew my contract at a lower rate.
Problem is i don't know which phone to buy.
And currently it seems that lotsa senior citizens are seen with a iphone, students using a business phone.
Why do they need such high tech phone uh?
Or it's me whom has been outdated?
Outdated me can't make up my mind over which phone to get coz i have not been attracted to any yet.