Rex:
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Voice mail costs minutes to check, and you don’t know what the message is (or in some cases, who called you) until you check it. If you’re in a meeting, you won’t be checking your voice mail, but you can still receive text messages.
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Turning off the ringer and letting calls roll to voice mail helps a bit, but it still costs you to check VM, and you still don’t get the message until you’re someplace where you can listen to VM. And if you want to place a call when you’re someplace where you can’t speak on the phone, you’re screwed.
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Well, it’s not as useful for everyone. I personally use it all the time… my girlfriend doesn’t have a cell phone, but she can email me from school to ask me to pick her up, etc.
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We have Cricket here too (and other areas have the same deal from companies like Metro PCS), but it’s not suitable for anyone who travels out of town, and their phone selection is pretty slim. Unlimited night/weekend minutes are pretty common with nationwide carriers, but few people have 1000 peak minutes.