You have to log into the system as Admin and enable CO COdes for the CLass of Service you are in. Its easy, at least the Admin should be able to do it.
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It depends on the phone. SOme phones allows total blocking of contacts while others only block calls. You may have to test this with a friend to see what level of blocking your phone supports. If it is a smarphone, you may need an app that allows blocking if your phone does not do it the way you wish
Step 1
Call the T-Mobile customer service
phone number located on your phone bill. Tell them you would like to
hear about T-Mobile's call blocking service. The customer service then
tells you how you can block all the calls coming from your T-Mobile
cell phone by adding this service to your plan. When you select this
service, anytime you dial a number from your T-Mobile cell phone, the
number will come up Restricted on the call receiver's caller ID.
Step 2
Dial
*67 prior to any number on your T-Mobile phone that you want to block,
if you want to just block one call at a time and choose which numbers
you dial are blocked. This is another way you can call someone and to
have it appear as a Restricted call on the other end.
Step 3
Program
your T-Mobile phone to block all calls to any one individual. Do this
by tapping Add a Contact on your T-Mobile phone. Type in the name of
the person you want to call. Then tap Add Phone Number. Punch in *67
then the number.
Step 4
Tap
the person's name to call him, when you have the person's number
programmed into your phone with the *67 first. Every time you tap the
person's name, you will be calling him from a blocked number.
I can help you with that, if you dial *67 and then the phone number, for example ( *67-715-392-0123 ) it should block your phone number from comeing up on caller id...........Hope this helps........
if you want to block your own number dial *67 before you dial... to block someone else try dialing
To activate Call Block or add a telephone number to the rejection list, dial *60. If you dont know the number to be blocked, dial *60 immediately after hanging up from the call. To turn off Call Block, dial *80. Call Block cannot block calls from some cellular phones, pay phones or business lines. It also cannot block most long distance numbers.
Call blocking apps let you create blacklists - lists of numbers to block from calling your cell phone. I like using LEO Privacy, it's very safe and makes me free. I always receive some harass calls, I'm really sad for that, until I found this app, I can add them into Blacklist. Love this app, so I recommand this app to you. https://goo.gl/BCKwGqLEO Privacy Applock Boost Hide Android Apps on Google Play
Usually to permanently unblock the number, you need to contact your phone service provider and ask them to unblock your number. You can then block it per call if wanted by dialing *67 before dialing the number.
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