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Yes *67
If you call your phone company they can block the number for you so you do not receive anything from that person anymore.
No
No
When someone doesn't want to talk to you, he or she will block your number. You won't be able to call that person.
usp pendrive port
they will figure it out. when you block someone's call they typically get a messages, busy signal, transferred to vm or hung up on. After a few times of not getting through they will get the idea.
busy signal
The best thing you really can do is block that number and remove the text.
In order to block an outgoing call from a landline, dial *67 at the beginning of the phone number. This will block your number to whatever number you dialed. Your number will not permanently be blocked, so you must dial it at the beginning of every number you dial where you don't want your number to be seen.
There are a number of ways to block phone number depending on what type of phone you have. Usually your manual will give the specific code to do so.
They will not know you blocked them.