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if it is prank calls or some one asking for others there isnt alot you can do(except use caller id)
prankers can dial any number and get the right combination and it you they have called, all phone companies recycle numbers.. so if your number was someone elses then you will get their calls
This is why we want the caller ID but i refuse to pay an extra $6 a month for the privledge when there are other companies that give it out for free. I don't mind the occasional phone call for someone else because I know they recycle the number...we've had the same one for 3 years and still get AT LEAST 2 calls a day for someone else!