Not sure if my girlfriend phone ran out of battery

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I sent few messages to my girlfriend and it's iphone to iphone which turns blue but the last couple if messages are free can this mean iphone ran out of battery
 

mpham2

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Aug 21, 2013
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If "are free" = are green then yes. It is trying to send as text instead of imessage. Could be off. Could be out of service area or imessage could be down.