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I apologize in advance if this is the wrong place to ask this, I didn't know a better place to start.

I have a rooted HTC Hero (CDMA) that is no longer receiving service and is just kind of...sitting there. Would it be safe to use it as just a device for accessing Google Authenticator? If not, please explain why not. I understand the risks of potentially losing it/not having it with me.

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It's perfectly safe if it's off the network. Something like that is an excellent use for an old device that's completely off the network -- as long as it stays in time sync.

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How would I make sure it stays synced? Can it do this over wifi? –  Nakaan Oct 26 '13 at 15:39
    
Yes, and if it doesn't seem to be working, there are apps that can do that (android.stackexchange.com/questions/2260/…). –  scuzzy-delta Oct 26 '13 at 19:26

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