If you want to wath your videos with no problems on your mobile phone, they have to be converted into 3gp. That's exactly what this free application called Need4 Free 3gp converter is intended to do.
Need4 Free 3gp converter is very easy to use and its interface is very intuitive. Add the video or videos you want to convert (it supports batch conversion) and select the device youw want to play it on from the list (that will help the program choose the best quality and video compression for your phone), click the convert button and in a matter of seconds (depending on the video length) those videos will be ready to play on your phone.
So, if you want to enjoy your videos on your phone and you don't want to spend any money on a conversion tool, Need4 Free 3gp converter is exactly what you need: Quality and simplicity for no money.