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When I SMS my friend (iPhone 4 to iPhone 3), green messages mean that it's a Message and blue messages mean that it's an iMessage.

However the messages that my friend sends me (iPhone 3 to iPhone 4) are all grey in color,

How can I tell which message service my friend is using to SMS me?

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If the messages are grey then they are being received. The colour doesn't change on the type they use. However if you use iMessage then the message back will be iMessage unless it stats above it that it is a message, as both users need to have iMessage enabled at the same time to use the feature, otherwise an SMS message is sent.

If you scroll up in the message history you will see what the last type of message used was. There will be a line break with iMessage or Message written in it. All messages after that point are dove via this method, until a new break is made.

imessage

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  • Btw is it true that iMessage only works if both iPhone has iOS 5 ?
    – Pacerier
    Commented Jan 3, 2012 at 12:55
  • @Pacerier yes. That is an iOS 5+ feature.
    – vcsjones
    Commented Jan 3, 2012 at 13:05
  • @vcsjones Ok just to confirm, if you take a look at i.sstatic.net/UPwtV.gif, does it mean that my friend originally does not have iMessage but now I can freely sms my friend's number (and the other way round) without incurring any sms costs?
    – Pacerier
    Commented Jan 3, 2012 at 19:49
  • @Pacerier it will be free if it is sent with SMS. SMS is used if an error occurs with iMessage, or the recipient does not also have iOS 5 or better.
    – vcsjones
    Commented Jan 3, 2012 at 19:51

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