Lockster в Android Market

Lockster (v. 1.0) Разработано Nivid Inc.

With Lockster you can lock your phone at a Set time (eg lock phone at 10:30AM) or a Set timer (eg lock phone after 30 minutes) or by simply sending an SMS. Once locked, you can unlock your phone by using a preset Lockster password or by using a preset device password or by not using any password in which case it will be use the default scroll lock.

This app provides parental lock (OR parent control) feature to device even when your kid knows your default device password.  SMS lock feature makes this app really usable with kids, just send SMS and it will lock the device.