I have one android that's on a data account, and I was thinking about getting a 2nd one, just to have around, and not paying for any kind of account. No phone minutes, no data account.... But I'm thinking I could get on wifi.... use any apps that don't require a data account, the GPS would work... and lots of other stuff. I could get a used G1 for real cheap and it might be nice to have around. Is anyone else out there doing something like this?
This is not something you need to think about. Just do it.
Let's say, you are a Motorola Droid user with Verizon. You bought a Droid X2. Your line is transferred to your X2. So what happens to your Droid?
Nothing. You can still use it like an Android iPod Touch around the house on any Wifi connection. Or in any mall or coffee shop with public wifi.
If you have an existing Android and bought a second one, just enter your Google account on the second one and it becomes an Android iPod Touch. If your line is on GSM and the second Android is GSM and unlocked, copy the APN settings into the second phone and you can transfer your SIM into it, and use that as a real second phone.
Note: there is no limit to how many Androids are attached to your single Google account.
Any games you paid on your account in any phone, becomes free to download on the other.
Please note that if you plan on lending the second device to kids, your GMail still goes into those devices and they can read them. Even reply from them. You can of course, set up a second Google account and restart the second device from there. That way, your GMail doesn't go into those but you will have to repurchase paid apps that you already paid on your other account.