I think the reason SMS/text messaging is not more popular in the US is that generally it's cheaper to actually make a voice call than to send a text message unless you have a text message plan with an allowance. Text message has the possibility of being a little more discreet but that's it. Earlier TDMA models you couldn't even compose messages all you could do is receive messages. On CDMA text messaging wasn't even part of the standard and was added as an afterthought.
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I think the reason SMS/text messaging is not more popular in the US is that generally it's cheaper to actually make a voice call than to send a text message unless you have a text message plan with an allowance. Text message has the possibility of being a little more discreet but that's it. Earlier TDMA models you couldn't even compose messages all you could do is receive messages. On CDMA text messaging wasn't even part of the standard and was added as an afterthought.