I'm not completely sure here, but I think that might be the iPhone.
You can't lock your iPhone apps without jailbreaking the phone.
The iPhone
no you cannot use ipod and iphone apps on itunes, but you can buy the apps on itunes and put them on your ipod and iphone
Yes, just use the same apple ID.
You would use it as an iTouch, all apps and settings just no phone or text.
it depends-if you will use the apps and internet aswell as the phone then yes but if you just want it as a normal phone dont waste your money.
No you may not. Apple's apps cannot be used for any phone other than the iPhone. If you want a cheap way to use all of the apps for the iPhone, get an Apple iPod Touch. It is $199 and it has no monthly bill, whereas the iPhone is $99 and it has a minimum $75 monthly bill.
In short....No. Iphone run their own opporating system so you can only use apps from the App Store. Android phone like the htc wildfire run an Android opporating system so you can only use apps from the "Android Market".
the iphone4 is better because the app world is more iPhone friendly then they are for android but as apps go an iPhone is able to access apps faster then the leading android phone.
no, iphone apps are only made to work with iphones, not other phones...
No you can use apps on the ipod touch also
As long as your computer has itunes that is authorised on the same itunes account as your iphone, then it will automatically transfer all your iphone apps onto the computer