How can you block a number from your mobile phone?

Good question. I don't think it has anything to do with the phone per se. I know that Verizon provides a way to block numbers on their residential land-line service. Contact your cell provider to see if they have that service.

Contact your network provider. Give them your IMEI number. They should be able to block your lost phone & make it unusable. The phone then becomes worthless.

PUKs, or personal unblocking keys, are used to unblock a mobile phone which becomes blocked. Mobile phones may become blocked when a PIN (personal identification number) is entered incorrectly on three consecutive occasions. In some instances, the phone may become blocked, which requires a PUK to unblock it, and in other instances, the SIM (Subscriber Identity Module) card itself becomes blocked and again will require a PUK to unblock it. Mobile phones are also blocked when they are reported stolen and if there is an outstanding payment on the account. It is important to differentiate between unblocking phones (using a PUK) and unlocking mobile phones (using another type of code). NOTE: It is a criminal offence for anyone to attempt to unblock a mobile phone, other than the network provider who put the block on the phone. If your phone has become blocked by mistake, for example you have entered the PIN incorrectly on three consecutive occasions, then you need to contact the mobile phone network operator with your details. To explain a little more, specific to your mobile phone network, You need to go to your Service providers, web site & navigate your way to the specific PUK details for your mobile phone network operator. Usually you have to Register your phone to get a PUK code.

IMEI(International Mobile Equipment Identification). Now if you have lost your mobile handset or your phone has been stolen, you can contact your network provider to block your IMEI number. They might ask you to get a Police FIR copy first, do as they say and finally ask them to block your IMEI number. Mobile network.
providers use a shared hosting service for blocking IMEI numbers, which means if you have asked network ‘Airtel’ to block your mobile handset, it automatically gets blocked by network ‘VodaFone’, ‘Reliance’, ‘Idea Cellular’ and so on.
Now when that thief will switch on your mobile handset, no service providers will allow it to build any connection with them. It does not matter if he changes the mobile SIM card, since SIM card requests for the service with IMEI number and a blocked IMEI number handset will be ignored and the mobile will become an useless toy.

If you know someone from any mobile network, you can also ask him to find out the mobile number that’s being used that IMEI number. In that way you will get the mobile number that thief is using on your handset Take help of mobile number tracker to track any mobile in India.
You can find more information about your mobile handset by entering your mobile IMEI no. Go to IMEI Number Analysis and know more about your handset model, manufacturing date and some internal informations for free.

PUKs, or personal unblocking keys, are used to unblock a mobile phone which becomes blocked. Mobile phones may become blocked when a PIN (personal identification number) is entered incorrectly on three consecutive occasions. In some instances, the phone may become blocked, which requires a PUK to unblock it, and in other instances, the SIM (Subscriber Identity Module) card itself becomes blocked and again will require a PUK to unblock it.Mobile phones are also blocked when they are reported stolen and if there is an outstanding payment on the account.It is important to differentiate between unblocking phones (using a PUK) and unlocking mobile phones (using another type of code). NOTE: It is a criminal offence for anyone to attempt to unblock a mobile phone, other than the network provider who put the block on the phone.If your phone has become blocked by mistake, for example you have entered the PIN incorrectly on three consecutive occasions, then you need to contact the mobile phone network operator with your details. To explain a little more, specific to your mobile phone network, You need to go to your Service providers, web site & navigate your way to the specific PUK details for your mobile phone network operator. Usually you have to Register your phone to get a PUK code.

PUKs, or personal unblocking keys, are used to unblock a mobile phone which becomes blocked. Mobile phones may become blocked when a PIN (personal identification number) is entered incorrectly on three consecutive occasions. In some instances, the phone may become blocked, which requires a PUK to unblock it, and in other instances, the SIM (Subscriber Identity Module) card itself becomes blocked and again will require a PUK to unblock it.Mobile phones are also blocked when they are reported stolen and if there is an outstanding payment on the account.It is important to differentiate between unblocking phones (using a PUK) and unlocking mobile phones (using another type of code). NOTE: It is a criminal offence for anyone to attempt to unblock a mobile phone, other than the network provider who put the block on the phone.If your phone has become blocked by mistake, for example you have entered the PIN incorrectly on three consecutive occasions, then you need to contact the mobile phone network operator with your details. To explain a little more, specific to your mobile phone network, You need to go to your Service providers, web site & navigate your way to the specific PUK details for your mobile phone network operator. Usually you have to Register your phone to get a PUK code.

Your PUK, or personal unblocking keys, are used to unblock a mobile phone which becomes blocked. Mobile phones may become blocked when a PIN (personal identification number) is entered incorrectly on three consecutive occasions. In some instances, the phone may become blocked, which requires a PUK to unblock it, and in other instances, the SIM (Subscriber Identity Module) card itself becomes blocked and again will require a PUK to unblock it. Mobile phones are also blocked when they are reported stolen and if there is an outstanding payment on the account. It is important to differentiate between unblocking phones (using a PUK) and unlocking mobile phones (using another type of code). More information on unlocking phones will be available here in the very near future. NOTE: It is a criminal offence for anyone to attempt to unblock a mobile phone, other than the network provider who put the block on the phone. If your phone has become blocked by mistake, for example you have entered the PIN incorrectly on three consecutive occasions, then you need to contact the mobile phone network operator with your details. To explain a little more, specific to your mobile phone network, use the links above to navigate your way to the specific PUK details for your mobile phone network operator.

u must contact the customer care along with your mobile number..u wil get the puk..only the mobile operators can provide u the puk...

please follow the steps carefully

1. 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.
   
2. 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.
   
3. 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.
   
4. 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.
   

hope you dooooo...
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thank you

Contact your service provider, they are the only ones who can give you the PUK for your sim