question about service

Hi,

I have my own business and my sprint plan is coming up for renewal. I am not for sure if I will keep it or go with a different service. I would like to know if anyone here knows if I can block calls on the phone so that it is only mobile-to-mobile. I do not want the problem of my workers using the phone for personal use and racking up a big phone bill. I only want them to be able to call each other and/or only my phone.
Is there a way I can do that with this carrier? Either request it from the carrier or else block the phones from dialing out except for certain phone numbers?

Thanks
Jeff

I know that most phones have it in their options that will restrict calls either only to other mobiles or to any local area code you permit them too.

Not too sure if you can do this directly with your carrier though.

I think that in your case your best solution would be to get nextel radios... if available in your area... that way they can only communicate with eachother only and no phone calls can be made... Most cell phone carriers will not block other calls because they would then be losing money by potential minute charges....