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It's Fixed...I can be classified as a geek, nerd, or techie. Over 20 years of experience in computers,...
I suggest you google smart limits
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SmartLimits (http://www.att.net/smartcontrols-SmartLimitsFor... is an option that you can have placed on your line to block up to 30 numbers from calling and messaging. There is a monthly cost of $4.99/line for that.
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Maintaining peace of Mind!!!
Besides smart limits that cost money you can also go to mymessages.att.com register your mobile number and add the mobile numbers to the blocked list. Also depending on your phone, there might be some auto reject setting under call setting in the menu, most samsung phones have these setting. You can verify these settings in the user manual available fromm att site under device support or the manufacturers site