Sprint Internet Filter Is There A Good Mobile Phone Internet Content Filter For Sprint?

Is there a good mobile phone internet content filter for Sprint? - sprint internet filter

Looking to upgrade to a data plan, but I have a filter web content on my phone, which is on the Sprint network. I have a Sanyo Katana. , Just like the Palm Centro, Samsung Rant, Samsung M220 and Sanyo S1. Any idea or suggestion? Thank you!