Due to the overwelming amount of questions we got on our first Sony Ericsson post; here's a follow up that will hopefully address your concerns.

The most often asked question was how do I unlock my Sony Ericsson phone?

One way you can try it is with a free unlock patch generator, such as the one I found here.

When it comes to inside info, Apple has been pretty up front about all the cool things the iPhone can do. However, because it's also a GSM phone, there are some semi secret codes that still work on it.

To display your IMEI (International Mobile Equipment Identity) Number, press: *#06#

Check if call waiting is enabled on your iPhone: *#43# followed by tap Call.