certain Phone numbers blocked

[Statos]

About a week ago I started getting busy signals to three numbers in my contacts and I know they do not have me blocked. When they try to call me they get a busy signal and I do not have them blocked. They all have Iphones with AT&T and I have a Nexus 6p with ST AT&T sim. Does anyone have any Idea what could be causing this???

[ST - Mark]

Hi Statos. My name is Straight Talk Mark. We're truly sorry for the inconvenience we have caused you. We are determined to help you in resolving your issue. To further assist you, please check your forum inbox for a message. Click on "New Messages" beside User Control Panel to view your forum inbox. You may also text the key word HELP to 611611 to view our self-service menu with a list of help key words with valuable information. Thank you for contacting us.