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I have discovered that at certain times, my iMessages are delivered as SMS instead; which is perfectly ok with me, considering I have it set up to do so. My question is, under what conditions are the messages sent as SMS with both myself and the recipient does not necessary been in a wifi area to receive or send it that when the recipient has their phone powered down that it is sent as SMS, and if that is the case...why is it that I receive messages sent as SMS instead of iMessages from the same recipient...what exactly does "...when iMessage is unavailable" mean??? Thanks in advance for any/all response(s)...

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It will send as SMS if your side appears to be offline, or on lower quality data network. You're asking multiple questions here, could you summarize them? – Rob Feb 21 '14 at 6:33
Thank you for your response question refers to the statement that a message will be sent as SMS when iMessage is unavailable. I was inquiring to find out exactly what conditions make iMessaging "unavailable" and was curious if a phone being powered down was a possibility; in addition to wondering why I at times, receive a message as SMS, when I have a very strong wifi and/or cellular signal. – Tonya Feb 22 '14 at 5:36
up vote 2 down vote accepted

If the sending phone has no 3G or wifi coverage it will send as an SMS message. Otherwise it gets sent as an SMS. If the receiving phone doesn't acknowledge the message after 30 seconds (because it doesn't have 3G or wifi coverage, or it's turned off) the sending phone will give up on iMessage and send it as an SMS.

If the sending phone has turned off the setting to "Send as SMS" then it won't send as SMS unless the user manually does it.

EDIT: If the receiving user has Messages set up on their Mac running Mountain Lion or Mavericks, and the phone is out of data coverage, the message could be received by the Mac and not the phone.

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Ok thank you for informing me to do so... I found this site on a whim via "google search" trying to find answers to my questions, so I don't really know the ins and outs about how things are done. I will say that I have bookmarked it, to use if I ever encounter another concern that baffles me and I am unable to figure out myself or find an answer to. Thanks again for your help. – Tonya Feb 22 '14 at 5:44

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