Report "I have sony ericsson k750i i have problem my phone if i want to call someone but i don't want let the people see my number in there caller id. when i go to setting and click call it shows me show or hide no and i selected it shows me three options which is 1) show number. 2) hide number. 3) network default. when i select hide number it says service activate and when i go back and it shows network default. how can i fixed this problems"