How to make SMS the default instead of iMessage on my iphone 5?

A lot of people like iMessage because you can text iphone to iphone via data or Wi-Fi instead of SMS, but right now it's kind of inconveniencing me. I have unlimited texting, and very limited data, so it's better if I use SMS and pretty bad if I use iMessage. However, I don't want iMessage to be completely disabled because I have siblings and friends who use iPods and the only way I can text them is through imessage. But if i'm texting a friend with an iphone, i'd like it to be SMS isntead of iMessage. Is there a way to make SMS the default option, without disabling iMessage? Because my phone automatically always wants to go to iMessage and i don't want that. I'm sorry if this is confusing.

INTERNET! BECAUSE SMS THE RULE!

When you send an iMessage, a bubble pops up like you sent a text message. Default colors are green for text messages and blue for iMessages. If you tap the blue bubble twice the phone gives you an option to ""send as text message."" It only gives you this option if the iMessage was not delivered. Once you swich to text messages, future messages will be sent as text by default. I don't know if they will swich back to iMessage if the recipient turns iMessage back on, but my guess is yes. This way you can sent iMessages to those who are not on limited plans and text messages to those on limited plans without having to turn off iMessage on your own phone. You can go back and send all messages not delivered still in your phone by double tapping and selecting ""send as Text Message.""
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