Q: Is there a way to keep my children from buying stuff in the Google Play Store when they're entertaining themselves with my Android phone?
A: Smartphones are great for temporarily distracting fidgety children.
But if you would rather not get a surprise on your credit card bill because little fingers wandered into the Google Play Store, you can set the phone to require a PIN (personal identification number) before apps and games can be purchased. You need version 3.1 or later of the Google Play Store on the phone.
To set up a PIN, open the phone's Google Play Store app. Press the Menu button and then Settings.
Select the "Set or change PIN" option and enter the numeric code you want to use.
Tap OK and re-enter the number to confirm it. Next, tap the box next to "Use PIN for purchases."
The PIN will now be required to make a purchase from the Google Play Store. Google has instructions at bit.ly/IfAXna if you need to change, remove or reset your PIN later.