Many Android tablets allow you to create more than one user account on the device. When curbi is running it will give you complete control over the user account that it runs under, but kids can create an additional account, switch to the new account and use the tablet with no curbi controls.
The way around this is to have your child use the tablet under a secondary account on the device. You should keep the PIN of the primary account to yourself and allow your child to use a secondary account.
You'll need to be running Android 5.0 Lollipop or higher to do this.
Step 1: Creating a New User:
Fully expand your notification tray by swiping down from the top edge using two fingers. From here, tap the small, circular icon in the top middle/right
Step 2: Next Select "Add User" - that way they can log in with their Google account
Once you've done that, you'll see a popup informing you about the specifics of adding a user. Press "OK" on this message, then you'll be greeted by the new user's lock screen. This is different than your own lock screen as it can have its own wallpaper, which is an easy way to tell which user is currently active.
Step3: Follow the Setup prompts and user your Google account to complete the setup process.
Step 4: Download curbi kids on the device from the Play Store and follow the steps to Activate the device
Step 5: Letting Secondary Users Make Phone Calls & Send SMS
By default, secondary users cannot make phone calls or send SMS messages. If you'd like to change that, make sure you're logged in with the primary user account (your own). From there, head to the "Users" menu in Settings, then tap the gear icon next to the secondary user's name. Finally, enable the "Turn on phone calls & SMS" feature, then you'll be all set
Step 6: You can complete your curbi rule and restrictions from the curbi Parent App on your mobile device.