Texting from ipad warning message

Question

When sending a text message from the iPad 2, I'm getting a warning message with an exclamation point that the text cannot be sent.  I am using WiFi and not Verizon or ATT service.
Thank you.

Answer 1

iMessage is not really txt messages.  They look like a text, but they are not.  You can only send to apple people that have the service turned on.   Text messages go thru your telecom provider to another phone.  The pad, of course, is not a phone, and cannot send anything on the phone network.
So what you are sending is handled by apple servers, but only goes to registered addresses.  For a pad, the registered address is an e mail address.  For an iPhone, it can be either a phone number on file w apple, or an e mail address on file with apple.
If you are sending from a pad, those are your only options.
If you are sending from an I phone, if the recipient is an iMessage person, it goes through as an I message.  If the recipient is not, but is a cell phone, the system will automatically send it as a regular text.  You may have noticed that from a phone, some of the messages are blue, and some are green,  that is the difference.  If you are sending to a pad from a phone, only the e mail address will work.
Ok?