Mass text messaging iPhone [via SendHype]
Learn how to use your iPhone for mass text messaging by using a simple app called SendHype. This app helps your send the messages manually or automatically using a custom-coded iOS shortcut.
Download SendHype from the AppStore:
You can define your custom contact group or use your iPhone groups you already configured in your Address Book.
You can also personalize the messages by using placeholders such as First Name, Last Name, etc. Recipients won’t see each other, just like BCC works for email.
More details about the app here: