Re: how do you send a mass text to let your contact now your new number
Welcome to iMore! Just open message, add all of the recipients at the top, and send the message. Keep in mind it will open up a group message though. Otherwise you'll have to send everyone a separate message.
Re: how do you send a mass text to let your contact now your new number
If you don't want to send a massive group text to all your contacts, go to settings. Scroll down to messages, then scroll down to the group messaging setting & turn it off.
You should now be able to send a mass text to all your contacts without annoying everyone with a group chat.
Hope that helps.