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hello, i have a friend and he is asking what is the difference between LT22i and LT22 my phone is LT22i and his phone is LT22 as we checked on "about phone" settings on the phone 
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Sony Xperia P has some series name depend on regional / country and also data network carrier. IT called as Sony LT22 (general), Sony LT22i Nypon, or if in North America usually uses Sony LT22a, but for the user guide aka the Manual of Sony Xperia P, it’s all the same.
http://pdadb.net/index.php?m=specs&id=3256&view=1&c=sony_xperia_p_lt22__lt22i_sony_nyphon
Sony Xperia P has some series name depend on regional / country and also data network carrier. IT called as Sony LT22 (general), Sony LT22i Nypon, or if in North America usually uses Sony LT22a, but for the user guide aka the Manual of Sony Xperia P, it’s all the same.
http://pdadb.net/index.php?m=specs&id=3256&view=1&c=sony_xperia_p_lt22__lt22i_sony_nyphon
In the Xperia P or lt22i or simply lt22 like in some pages is named there is no difference, physical is lt22i.
In other devices like for example live with walkman the wt19a US for Mexico, USA(and a third country that I don't remember) and the wt19i is for the other countries, the difference between "a" and "i" is the band that they can work
The Xperia P doesn't have "a" because it works in 4 bands and works in every country(like the wt19 have 3 band so one band changes in the I versions to work)
-xda