how do i physically do the upgrade needed for simpsons tapped out

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i'm trying to update the game because whenever i try and visit a friend it says that they have upgraded. and i don't know jow to do the actual upgrade on a lg g2 phone
closed as a duplicate of: How to update Tapped Out?
asked May 14, 2014 by anonymous
retagged Jun 28, 2014 by Loco87 (talk)
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