both send and receive
No, wifi uses the internet in your house, school, or where ever you are. You won't be charged for data from your cell phone provider.
I do believe it is since the unlimited data is the connectivity to the internet. Without data you have no internet. Hope that helps.
A data call is where a person uses their cell phone as a modem to send a fax or e-mail through their cell phone.
No you do not get charged for "installing" a Facebook client application, unless whoever that makes the software is charging for the software. "Internet usage" related to the downloading of an installer, connecting to the Facebook mobile server by opening the application, and other activities you do on Facebook may or may not be an additional cost depending on what data plan you have with your cell phone carrier. I strongly recommend that you have an 'unlimited' data / mobile internet plan.
Whatever phone you put your SIM in becomes your phone and number. If there is no data attached to your specific number you will get charged for using data regardless of what phone you put it in..
A 'data plan' is an agreed amount of data that can be sent from your phone - without being charged for it. Think of it like a call allowance for data. Even if you don't have a data plan, you can still send data from your phone- however - you will be charged by your carrier for the amount of data you send (usually per MegaByte).
If you have Bluetooth , Infrared or Data cables connected to the phone you can overcome it.
Data usage pertains to internet usage. Data can be affected by multi media messages with pitcures or videos, GPS, downloading apps, uploading to Facebook, as well as surfing the web.
First and foremst, in order to activate a G1 phone you would need to setup your gmail account on the phone. And in order to do that, you would need internet and data on the phone.
You would need to get a data plan for the phone if you want to use the internet on it.
If you data plans allows you to download 8Gb on your phone's internet, it is a lot. Most of what is downloaded on a phone is under 1Gb, aside from large games or movies.
To browse the internet at home without being charged you would have to have access to a unsecured network, or know the password for a secured network. If your phone is connected to a home WiFi, then you do not incur any charges on your mobile network. So data plan or not, everything is routed through the Home system, you are not using your phone's normal provider.