If your carrier is ATT as the category suggests, then no! You can get a plan without data and put the SIM card into your BlackBerry. You can do this with any GSM phone. GSM carriers include ATT and T-mobile.
If you use a CDMA phone (carriers such as Verizon and Sprint), then you would only be able to if the carrier allowed you to, which depends on the salesperson helping you switch to your unlocked BlackBerry. (Keep in mind, CDMA carriers usually do not allow other carrier's phones on their network anyway).
Before you can use internet on an Blackberry phones, you would need to register the device for the special Blackberry Data plan. Any regular data plan would not work on Blackberry phones.
as long as the phone is unlocked you can use it with any sim card. however blackberry does use a different kind of data so you need to make sure your plan is compatible with blackberry
If the Blackberry 8800 is already unlocked, then yes, you should be able to use the phone on the Orange carrier. If you want to use the Blackberry data service, then you would need to register the device for a Blackberry Data plan as regular data plans do not work on Blackberry phones.
the fruit
Blackberry and the carriers require you have a data plan for all Blackberry phones.
Only if you want to be able to access the internet with it. If you don't plan on doing that at all or only limited data usage, you don't need a data plan.
If you just want to use the phone and text functions of the Blackberry, then you don't need to, however, if you want to use data, then you should register your phone for a Blackberry service as any regular data plan would not work on Blackberry phones.
You can get a data plan from a service provider such as Verizon.
If you are on a data plan its free. If you aren't, you can still use it if you have wifi. For example, if you have wifi in your house you can go on the internet for free when you are at home. If you have a data plan it allows you to go on the internet even if you dont have wifi.
You can use the Blackberry Storm for phone and text. You don't need internet to make it work. On the other hand, if you want to use internet on your Blackberry Storm, you would need to register the device for the special Blackberry Data plan as any regular data plan would not work on Blackberry Storm or any other blackberry Phones.
Yes as long as you have a data plan with blackberry
It is as long as your services includes a full data plan and messaging plan.