I do use text messages, but not txt spk - can't get the hang of it (don't really want to!) and it took me a while to get the hang of predictive text; they're handy if you just want to provide a bit of info (like the bus is running late), can't be sure the recipient is near a computer or if you're not sure it's a good time to call. From what I've read, the principle caught on over here far more quickly than it did in the States. The kids, of course, use them all the time.... 
From Vnunet (latest report I can find):
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Mobile phone users in the UK send an average of 1.2 billion text messages a week, according to the latest quarterly UK research by the Mobile Data Association (MDA).
The figures show that 4,825 billion messages were sent during September 2007, the equivalent of 4,000 every second and equating to all the messages sent during the whole of 1999.
That's for a population of around 60 million. Also, texts are generally much cheaper than voice calls, with contract users sometimes having a monthly allowance of hundreds included in their line rental. Orange pay monthly, for example, has plans that offer 100, 500, or unlimited texts per month, depending what you pay. On my Pay As You Go tariff (Virgin mobile), calls are 15p for the first five minutes each day, 5p a min after that, but a text costs just 3p to a Virgin phone, or 12p to phones outside the network. So still cheaper than a voice call.
And in the US...
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About 75 billion SMS text messages were sent in June, averaging about 2.5 billion messages a day (17.5bn a week), the report said. This represents an increase of 160 percent over the 28.8 billion messages reported in June 2007.
On a related note, the use of handheld phones while driving is against the law in the UK.
I do use text messages, but not txt spk - can't get the hang of it (don't really want to!)
Next time I catch you using an internet acronym in a post.... 
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and it took me a while to get the hang of predictive text;
don't even know what you're talking about
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they're handy if you just want to provide a bit of info (like the bus is running late),
Just a phone call works for that. Then you know whether or not the message was received. If the person doesn't answer the phone, it wasn't*; if the person doesn't answer the txt msg, you don't know.
*Ok, if they have an answering machine, and you leave a message, you don't know either. 
STRIKE ONE
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can't be sure the recipient is near a computer
Ok, if it's an emergency, a phone call works better. You get instantaneous responses, which helps you be sure the message you're sending is received and processed properly. I can imagine exchanging several text messages, then calling in frustration because the other person doesn't "get it". I've done that after exchanging e-mails. If it's not an emergency, e-mail is fine. You tend to learn how often people check their e-mail. I still can't see a good reason to text.
STRIKE TWO
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or if you're not sure it's a good time to call
See above regarding urgency. Plus, "Hello, is this a bad time to call? I can call back later." Or use e-mail.
STRIKE THREE
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texts are generally much cheaper than voice calls
This one is interesting. With our Family Plan, we pay a flat rate for up to X minutes. We've only exceeded the limit once. So, 99.9% of the time, a phone call does not add a dime to our bill. However, every text message, whether incoming* or outgoing (our sons get them, and one sends a few himself) adds 15 cents to the bill. So, if that were true for us, I'd see a legitimate reason to use texting.
*I hate that!
STRIKE ONE (with one out)
I'm gonna be tough to convince.
I do use text messages, but not txt spk - can't get the hang of it (don't really want to!)

Next time I catch you using an internet acronym in a post....

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and it took me a while to get the hang of predictive text;
don't even know what you're talking about
I'm gonna be tough to convince.

Predictive text - the phone carries a dictionary and 'guesses' (or predicts) which word you want from the combination of key presses. Hard to explain and took a little while for me to get my head round it
Wikipedia
As to cost... well, I am a Scot 
Ain't gonna try to convince you - each to his own
Guess that's as near to laid-back as we can get...
However, every text message, whether incoming* or outgoing (our sons get them, and one sends a few himself) adds 15 cents to the bill.
I read somewhere recently that this is only true in the good ol' USA - the rest of the world [or at least many other countries] do not get charged for incoming calls or texts...
KB
Ain't gonna try to convince you - each to his own...
I'm just being a contrarian. So glad you didn't say "each to their own" 
you might want to read this for a good explanation of the advantages and disadvantages of using text messaging:
http://communication.howstuffworks.com/sms1.htm
Thanks! A good read!
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1) It is more discreet than a phone conversation, making it the ideal form for communicating when you don't want to be overheard. 2)It is often less time-consuming to send a text message than to make a phone call or send an e-mail. 3) (it) doesn't require you to be at your computer like e-mail and instant messaging (IM) do -- 4) SMS is also a convenient way for deaf and hearing-impaired people to communicate. 5) (It) can be used to send a message to a large number of people at a time, 6) Because SMS doesn't overload the network as much as phone calls, it is frequently used by TV shows to let viewers vote on a poll topic or for a contestant.
1) Go somewhere else! Maybe a phone booth?
Or use e-mail.
2) Ok, when I get that busy I'll try it!
3) No, but it requires you to have your cell phone, so you could just call the person.
4) Agreed, good point. My wife says that could be the clincher for me now! 
5) So can e-mail
6) ...because we can. Got along fine without that ability for, what, 75 years? I only vote at the polling place.
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Here are a few of the disadvantages of SMS:
You have to pay for it. Most wireless plans charge for a certain number of text messages a month. Some only charge for user-originated messages, while others charge for incoming messages as well. If you exceed your message allowance, you may be charged 10 cents per message, and those little charges can add up.
Speedy message delivery is not guaranteed. During periods of high traffic, it might be minutes or even hours before a message gets through.
Interesting. I know e-mail is delayed sometimes too. What about "Instant" Messages???
However, every text message, whether incoming* or outgoing (our sons get them, and one sends a few himself) adds 15 cents to the bill.
I read somewhere recently that this is
only true in the good ol' USA - the rest of the world [or at least
many other countries] do
not get charged for incoming calls or texts...
I think I'll move to Australia.
I'm still not convinced it's useful.
I'm about to do something unprecedented... 
IAWXABD
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phone conversations, which almost demand full attention and must be responded to immediately
NO, no!
That can't be! Otherwise, how do all those people manage to drive around without hitting anything, mostly?
Nor do I find it necessary to answer the phone when it is inconvenient and especially if I know who it is that is calling! Thank goodness for Caller ID! 
Other than that, a good summary of different means for different ways to communicate! 
BTW, Gregg, I think some might argue that those pay phones were simply "provided" out of the phone companies benevolence!
Nor do I find it necessary to answer the phone when it is inconvenient and especially if I know who it is that is calling! Thank goodness for Caller ID!
Caller ID is another thing I find to be unnecessary. We don't have call waiting or voice mail either, but we do have an answering machine(AM). With all of the political "surveys", recorded messages, and fund raising going on right now, we let every call go to the AM even when we're home. If it's someone we know, we pick up the phone and interrupt the message they are leaving for us. The "caller ID" is when they say, "Hi, Gregg. This is...." The "live" callers we don't know usually don't leave a message, but the recorded messages play through. :four!: or is it :fore!:? for, 4...