Maybe you shouldn’t know. Part of the reason why your parents took your phone. Maybe they’ll take your computer access next if you try and find a way around what they’re doing for punishment or your own good.
@aanuszek1 I agree. I know I can send texts to my email address (I used to do that to get pictures from my phone to my computer), so just use a client to send messages to your friends cell phones telling them not to text your phone, but your email address instead until you get your phone back. If you friends still text your phone, well, sucks to be you.
You can always ask your carrier if they know of anything that could help.