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Help help!! i have confusing connectivity problems with my samsung galaxy mini

my samsung galaxy mini often disconnected from the internet.. no service..
but my friend who have the same service as i got perfect signal..
the phone got disconnected very often from the service..
-____________-
could you somehow help me with it..
and i don't understand what is VPN?? and how can i set it??

and i also have problems with my yahoo messenger
after i sign in.. loading online contacts.. it takes so long
and after its finished no one is online..
after that i checked at my computer.. many of my friends are online..
i repeat it disconnect and connect again
sign it off and sign in again..
but it keeps the same problems
please help me~~ T________T
 

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