Softbank

SoftBank Mobile Corp. (ソフトバンクモバイル株式会社, Sofutobanku Mobairu Kabushikigaisha,) is a wireless service provider in Japan. They used to be known as Vodafone K.K., so some of their older phones will have the Vodafone logo on the front.

Softbank Multimedia Lock
All models after and including the 920sh have a new feature known as Multimedia Lock. This feature disables all media services from cameras to music players, until a valid USIM is inserted. There are several ways around this, but they involve shipping your phone to Taiwan for a big price, and then following a strict set of rules to prevent it from relocking the media.

In addition, all Softbank models after and including the 923sh have CPR issues present which adds to the greater chance of mis-alligning the hypersim and the SIM thus resulting in a Multimedia re-lock.

Software Unlocked Phones
The following Softbank models can all be software unlocked:
 * 902SH
 * 903SH
 * 703SH
 * 703SHf
 * 801SH
 * 802SH
 * 803T
 * 810T
 * 811T
 * 813T
 * 814T
 * 815T
 * 902T
 * 903T
 * 904T
 * 911T
 * 912T
 * 920T
 * 707SC/II
 * 920SC
 * 740SC

Some of these models had the capability to be fully unlocked (MMS, Internet, etc.) while others do not. Note that there are other models as well that can be software unlocked.

Select models from the Sharp 93xsh series are capable of a full software unlock, allowing free use of MMS, SMS, Calling, Web, etc. without the need for a hypersim or a media unlock. The APN can only be changed by the unlocker, however, which may cause problems if you frequently change your service provider. There are still limitations with the unlock though, such as problems with Softbank specific services.