t-Mobile has these tiered refill cards for their prepaid mobile phones. The pricing table is here and reproduced below:

$10 for 30 minutes, expires in 90 days
$25 for 130 minutes, expires in 90 days
$40 for 208 minutes, expires in 90 days
$50 for 400 minutes, expires in 90 days
$100 for 1000 minutes, expires in 365 days

So which card should you buy? You could calculate a per minute cost and conclude that $100 for 1000 minutes is the most economical (plus it doesn’t expire for the longest time). Wrong!

It depends on how much you use the phone. The fact that the minutes expire makes the prepaid plan a virtual monthly plan in the regime where you do not use 1000 or more minutes per year, which is highly likely for people who choose prepaid phones to begin with (e.g. temporary visitors, odd occasions, emergencies, etc.). The constraint in that case is the expiration, not the number of minutes. If you blindly purchased $100 refills one after another, you’d have more and more unused minutes piling up. Sure, you could still use them, but even at $0.10/min. it is expensive compared to a straight monthly plan if you really mean to call that much. Of course you don’t, so now what?
(Read the article)

Comments(3)

This is part of the hard disk recovery documentation.

Part 4.

I rammed my head against the wall (of absurdity that is ext2), and all was clear

The obvious need to fork off another hard disk recovery project from a hard disk recovery project was just too pathetic to think about so I kicked this aside for a day. Today I started back from the beginning, this time researching the ext2 filesystem. The documentation (that is within reach of Google) for this file system is just poor. Whoever is responsible for documenting this part of Linux should be flogged, or at least made to go home and do it over. Yeah, I can go look at the source code (which I did), but I’m sorry, that does not constitute proper documentation.

(Read the article)

Comments(0)