Some words about safety of your Bitcoins:
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Bitcoins in Bitcoin Wallet are stored on the device.
If you lose your device, you'll lose your Bitcoins.
Just like money in your physical wallet.
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Before uninstalling Bitcoin Wallet (or clearing app data/wiping your device), transfer your Bitcoins to another wallet.
Any remaining Bitcoins will be lost.
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Before updating Bitcoin Wallet, always consult the recent changes in Android Market!
Do not activate automatic updating.
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Transactions cannot be undone.
If you send your Bitcoins into the void, there is no way to get them back unless you know the receiver and she is willing to send them back.
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Keep your Android device safe!
Do only install apps you fully trust.
Malicious apps could be trying to steal your wallet.
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Keep the risk low! Only use Bitcoin Wallet with small amounts for day use,
and keep your Bitcoin savings at a safer place.
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If you just want to try Bitcoin without risk (but without the ability to actually pay for something), consider using Bitcoin Wallet for Testnet (separate app).