I`m trying to find a way for my my member to communicate between them...on their cell phone

for exemple peoples are at a club or restaurant and could update their status(like facebook) via (cell phone) and tell member online where they are...or vice versa...member online could send a message on cell phone.

i know that we can log in on the web with a cell phone but it s does not look great...anyway fro mine

looking more sms, mobile website, rss or any other way

expemple not the whole profile just like this exemple...

Simplegirl:
Status: Guys we are at club1 come to meet us!

anybody got an idea how to acheive that?? or someone got something similar??

thx for your idea