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If you mean to block them sending texts to you or calling you, you would have to call up your Network Operator as there is no inbuilt blacklist on the iPhone 4. There is a way if you have your iPhone jailbroken which would be to download iBlacklist but it does cost to download it and I don't recommend jailbreaking.
What else can I help you with?
How do you block a number on iPhone 4?
You don't have a reject list featured in an iphone .. However you can buy an application related to it & bingo your problem's solved :)
How do you block somebody on ooVoo on an iPhone?
press the block button
Where can I find more information on unlocked iPhone 4?
You can find out more information on the iPhone 4 from friends, by asking someone at the store, or by looking online. I have unlocked the iPhone 4 by just asking friends and looking it up online.
What is the difference between the iPhone and iPhone 4?
An iPhone 4 is an iPhone.....
Why is the iPhone 4 called the iPhone 4?
It is the 4th model of iPhone. But iPhone generations do not go from one up: 1. iPhone 2. iPhone 3G (because of 3G connection) 3. iPhone 3GS 4. iPhone 4. 5. iPhone 4S
Is there an app for the iphone 4 that wen someone texts you it shows a color in the front camera?
Current, no there is not.
What is A free iPhone app to block calls?
yes
Can you block incoming calls on iPhone 3GS?
Yes
How can you connect with someone who has an iPhone if you dont have an iPhone?
call his/her mobile(iphone) or sms
Can you use FaceTime on the iPhone 4 if whoever you're talking does not have an iPhone 4?
No you both have to have an iphone 4 :)
Will a iPhone 4 case fit a droid?
No, they made the iPhone 4 case for a iPhone 4 not a droid.
Does the iPhone 4 have iOS5?
Do the iPhone 4 have ios5
