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LT26 is the phone technical name for the phone and the last letter like "i" tells you regional customizations like network and such.
As above Sony usually release A. C and I models which was for different networks however they stuck with just the "I" and made it compatible for all
There is however also a LT26W aka Xperia acro HD which is the Xperia S without the illumination bar and waterproof
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