Samsung GT-B7722QKASKZ Troubleshooting, Your phone displays Service unavailable or Network error

Troubleshooting

When you turn on your phone or while you are using the phone, it prompts you to enter one of the following codes:

Code	Try this to solve the problem:
	When the phone lock feature is enabled,
Password	you must enter the password you set for
	the phone.
	When using the phone for the first time
	or when the PIN requirement is enabled,
PIN	you must enter the PIN supplied with
	the SIM card. You can disable this feature
	by using the PIN lock menu.

Code	Try this to solve the problem:
	Your SIM card is blocked, usually as a
PUK	result of entering your PIN incorrectly
	several times. You must enter the PUK
	supplied by your service provider.
	When you access a menu requiring the
PIN2	PIN2, you must enter the PIN2 supplied
	with the SIM card. For details, contact
	your service provider.

Your phone displays "Service unavailable" or "Network error"

•When you are in areas with weak signals or poor reception, you may lose reception. Move to another area and try again.

•You cannot access some options without a subscription. Contact your service provider for more details.

Troubleshooting 77