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I am currently using Xperia Z2, Is this possible to exchange xperia z2 to z3 ?
Hi, in my honest opinion....there really isnt much difference between the Z2 & Z3.......i actually much prefer the Z2 
Wait until approx March for the Z4.........rumours are very good about specs etc & could be Sonys only flagship release until the following year :smileysmileythumbsup:
From time to time,network carriers have this kind of offers.
As mentioned on the other posts; if your carrier not doing somekind of promotion (never seen this in the US) you'll have to sell the Z2 yourself and then buy the Z3.
IMHO specs-wise Z3 only offers minor improvement over Z2 and I not a fan of the front facing speakers design.
I think it took away the high end feel of the Xperia phone.
If the leaked photo is correct Z4 will have the similar front facing speaker location/design as the Z2. Hopefully I'll have enough money to upgrade and not too jaded from the solution for 4.4.4. woes when the Z4 comes out.
i want to xchange my xperia z1 with xperia z3 is there is any offer regarding the same
You need to check with your local operators or sony services.