If you want to know whether or not another user’s goTenna is turned on and within range, open a 1-to-1 chat with that user. Tap on the contact’s name at the top of your main chat to send out a ping. If the user is in range, you’ll see a green checkmark indicating that person’s goTenna is on and within range.
You can also type out a 1-to-1 message and if the recipient’s goTenna is turned on and within range, a green checkmark will confirm your message got through.
No matter which method you choose, a red failure icon will alert you that the message did not get through which means that person’s goTenna is off and/or out of range. Try, try again later! :-).