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What is the difference between J108a and J108i?
is there any difference? what does the vowel mean (J108a - J108i)?
THANKS... !
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The i stands for International and the a for American.The main difference between these two versions of the phone is the frequency at which they receive 3G/H signals, according to the respective frequencies that the networks transmit 3G/H in different regions of the world. Other than that, they are virtually identical handsets.
Its just states the region the phome belongs to..
I mean my is lt15i ( xperia arc ) and one user using the same phone in u.s.a has lt15a
so its just the letter..and everything else is the same..
But you should wait for some other to reply and confirm this ok..
Ok thanks! I will wait for some other answer... in order to confirm this.... 
Hmm 
The i stands for International and the a for American.The main difference between these two versions of the phone is the frequency at which they receive 3G/H signals, according to the respective frequencies that the networks transmit 3G/H in different regions of the world. Other than that, they are virtually identical handsets.