did you try to connect on both wifi and 3g ? maybe it is a problem with your google account or firewall , try disabling adfree or any adblocking app or firewall , try using another modem router , try a different browser , do you get an error message somewhere ? what is the browser saying when it doesn't let you open a page ? what is the play store error ? are other google apps working ? if it is a problem with gapps try freeing cache of google services .
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