This is the good news I learned today from Jon's latest blog at Appfrica.net. In case you don't know, Twitter is a "micro-blogging" service that lets you send tiny posts, limited to 140 characters each. The posts appear on your page where (as you choose) others can view them, but they can also be broadcast by mobile phone text messaging (SMS) to anyone subscribed to you. You can choose to let everyone subscribe, or you can let only approved individuals subscribe, depending on your needs.
The problem has been that last year Twitter stopped sending out those SMS messages in most countries of the world, basically because they didn't have any way to fund the service--someone has to pay for all those messages. Now, as Jon describes, you can use a new service called Twe2 which does send text messages around the world. They're financed by attaching a small text advert to each one, which seems to me a reasonable price to pay to receive free text messages by Twitter.
I'm still trying to subscribe ... it's very easy but requires your mobile phone number to be verified, and sometimes here in Jos it takes many hours for SMS messages to be received, so the verification could take a while.
Now, if I can just figure out a good reason to use Twitter ...