On Running Multiple Apps on the iPhone

So, the iPhone won't run multiple apps, due to a restriction by Apple. This is a good idea, as has already been explained many times: multiple apps on a phone with 128 MB of RAM and a processor underclocked to 412 MHz. However, some useful things are also shot down such as,

• The "badging" of icons on the home screen won't be in real time. Apple's mail app listens for when an email comes in, and then displays an update number on its icon. Apple's SMS app listens for SMS messages, and does the same thing when a message comes in. Third party apps won't be able to do this in the background, because they won't be running anything in the background. This will most likely be most damaging for a couple of kinds of apps: IM, Social Networking, Third-Party Email, VOIP. However, VOIP apps also face a special problem, specifically,
• VOIP apps cannot receive calls when they are not running. HUGE downside. According to apple, VOIP can only be used on a wireless network and not over the air, but if I was going to download and install a VOIP app, I would want to be able to receive calls at home using VOIP as well as the cell phone. Either an apple-blessed third party VOIP provider will get to run things in the background, or VOIP on the iPhone will be limited to making calls. As I said, HUGE downside.