to text my friend in singapore from the united states? i know the number i have to do first is +65, but thats it..
it's possible if your phone provider allows it on your plan/service. be aware that it will probably cost more than a text to someone in the US though.
from daylight...
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I don't see why not as long as you know the country code and phone number. It may cost you a pretty penny, but you can. There are also many free internet sites that allow you to send texts from you PC.
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It depends on your service provider. I've sent messages to my brother in the US and it reaches in a few seconds. which is cool
it's possible, it'll cost the other guy tho.

EDIT: to guitar12: what?
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Yeah, I'm always texting people in Australia whilst i'm in England, and vice versa. Just remove the 0 from the start of the number, and replace it with the country code. It will cost a bit more than a normal text, but not that much. It's 10p for me to text someone in the UK and 20p to text someone internationally, so it's not that much difference really.