Limit incoming/outgoing kids text messaging

The barring password is required when using the Call
barring service to restrict incoming calls to and
outgoing calls from your phone (network service).

● To view or change the security module settings, select Menu > Settings > Security > Security module
sett..

Locking Your Phone
When your phone is locked, you can only receive incoming
calls or make calls to 911, Sprint Customer Service, or special
numbers. (See “Using Special Numbers”on page 63.)
1. Press Menu > Settings/Tools > Settings > More... > Security
and enter your lock code.
2. Select Lock My Phone > Lock Now. (To setyour phone to
lock the nexttime itis turned on, selectOn Power Up.)
Unlocking Your Phone
1. From standby mode, press Unlock(rightsoftkey).
2. Enter your lock code.

Here's the link to the manual if you need it: LG Rumor Manual

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Log into your Sprint account on the web,

Click the "SMS Messaging" link in My Online Tools, then click the "Settings & Preferences" link in Text Messaging Options.

If that doesn't help, just call Sprint (or whoever your carrier is) customer service and they can turn off incoming SMS messages.

you should take the phone into t-mobile center and have them assign the settings for the phone.

It's not possible.
It sucks. I wish it could be.

some times cos of the area u might have to stuff with the settings in the network settings section.

Enter Menu 4-3-1 (Settings-Security settings-Restrict calls).
The "RESTRICT CALLS" options will be displayed.
Use the arrow keys to select "RESTRICT OUTGOING CALLS" or "RESTRICT INCOMING CALLS" and press the softkey under "SELECT."
A display prompting you to enter your Security Code will appear.
Use the keypad to enter the Security Code and press the softkey under "OK."
The choices "SELECT" and "ADD RESTRICTION" appear on the display.
Select "ADD RESTRICTION" using the arrow keys and press the softkey under "OK."
A display prompting you to enter the number string you wish to restrict will appear.
Enter the number string or name you want to restrict and press the softkey under "OK."
Example: 1905 will restrict all calls beginning with 1905.
262 will restrict all calls by the name of Bob. B(2)o(6)b(2).
The message "Saved" appears and he desired numbers will be restricted.

Use the network services menu for this...

Use this menu to access network services. Please
contact your service provider to check their availability and subscribe to them, if you wish.

This network service allows you to restrict your calls.
1. Select a call barring option:
• All outgoing: prohibit outgoing calls.
• International: prohibit international calls.
• International except home: only allow calls
to numbers within the current country when
you are abroad, and to your home country.
• All incoming: prohibit incoming calls.
• Incoming while abroad: prohibit incoming
calls when you use your phone outside of your
home country.
• Cancel all: cancel all call barring settings,
allowing to be sent and received normally.
• Change barring password: change the call
barring password obtained from your service
provider.
2. Select the type of calls to be barred.
This network service allows you to restrict your calls.
1. Select a call barring option:
• All outgoing: prohibit outgoing calls.
• International: prohibit international calls.
• International except home: only allow calls
to numbers within the current country when
you are abroad, and to your home country.
• All incoming: prohibit incoming calls.
• Incoming while abroad: prohibit incoming
calls when you use your phone outside of your
home country.
• Cancel all: cancel all call barring settings,
allowing to be sent and received normally.
• Change barring password: change the call
barring password obtained from your service
provider.
2. Select the type of calls to be barred.

if you have any queries about your mobile..you can have a look at this user manual which can be downloaded from

http://safemanuals.com/user-guide-instructions-owner-manual/SAMSUNG/SGH-D600-_E

hope this helps :)

menu/setting/security/call barring

You go to settings and security. You'll need your code though (which should be the last 4 digits of your cell number, unless you changed the lock code already) and then play around with the options, and there is an option to block them.