Well, most people who begin developing games make a tetris and I ain`t no exception. The special features of this one are a round mode (remove all marked blocks to access the next round), a handicap mode, a shadow option (so that you can see where will the block fall), smooth drop, enhanced movement control and non-instant deployment of blocks (very useful in fast levels, but sometimes anoying)... well you may not like some of the last three features mentioned but if so there are tons of tetris implementations for phone out there. It should work on any midp 2.0 phone, but i`ve only tested it with my siemens s65v. There is also a version for nokia series 40 (for those nokia series 40 with no midp 2.0 support).
Updated: now there is also an untested midp 1.0 version
And yes, it`s a beta version, but I don`t think I`m gonna improve it anymore anyway