Hi! I have a Motorola Citrus phone of Verizon connection. One phone number keeps on disturbing me by giving missed calls. I searched about this number and found that it is a number of at&t connection. I am fed up with these missed calls. So I want your help. Can you tell me how to block at&t mobile phone number from my mobile phone. Please tell me to block only this number not all at&t phone number.