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mine is z550i too,i donald主題in uwants.it is free i always donald!i suggest you 仙註冊,
then you will find a button call手機you 按it,then chose sony ericsson.you will find many.some is beautiful.the Internet is;
http://www.uwants.com/
give u some tips:it has some one post that`` 原創主題70個~K800I~28/7新增~動態~再做KERORO~保證出面搵唔到~ 1 2 3 4 5 6 .. 56 ''don`t按,although it has many pretty 主題,z550icannot use,t have already tried!