php - Can a server notify iOS/Android app about changes whitout the users being aware? -

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i new in mobile development , have project , spent whole past days searching solution problem until got lost hope can find final answer here.

i have server (php & mysql db) , developing mobile app in ios + android retrieve data server. mobile app should take data server in first run , save in phone whenever run again take stored data.

the server should notify app "without user being aware" whenever change made app can go , update data immediately.

i thought using webservice (probably rest restkit) or applying sort of timestamps on server records, not problem.

my problem can't find way let server notify app changes whenever change happen , allowing app update new data. thought using push notifications - specially in ios - can't hidden users.

so there possible way it? complex? worth? other suggestions?

as said new maybe thinking wrong sorry in case, , searched through questions , couldn't figure out answer question.

can explain trying do? classic idiom here update data when application started (you can use cached version it's still up-to-date , if user has no connection) why update data if user not aware of it?


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