Support Only ppl with smartphones receive my texts, WTF?

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http://androidforums.com – Some of my friends say they aren't receiving my texts and those that make this claim all have one thing in common... they don't have smartphones. Some only receive garbled text, nonsensical partial sentences or letters that don't spell anything, I have noticed the ones who get these garbled texts all have cheap little flip-phones, or trac phones. Others will receive my texts but only every other one I send. I notice when I type more than a sentence or two, they almost never receive them. Friends will whip out their phones & show me what my texts look like & it's ridiculous! It (General)