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Yeah my mom is the same, she was kinda forced into a early model type of smart phone just because they didnt have any regular flip phones. She pretty much refuses to use it I had to buy a old sprint phone from ebay and she likes that haha. However my dad took to a smartphone like a fish to water he loves it and couldnt do without it. I think my parents generation will be the last that will be anti tech for the most part.My gf's dad likes things simple too he has a basic flip phone, it has push to talk feature but because he needs it for job sites but thats where he draws his line haha.
Oh and when I had my evo it had the imessage app so to answer your question I believe all android os phones can use it.
Oh and when I had my evo it had the imessage app so to answer your question I believe all android os phones can use it.