Disable call waiting

[kjaslow]

I had already put in *70 as the "Call Waiting Off Code." However, this setting seems like it is likely there to support the menu function from the phone: Call Features | Call Waiting|Disable. But the purpose of *70 is to dial it at the start of a call, and the feature will be disabled just for that phone call, without disabling it altogether. In other words, it will re-enable on the next phone call. This seems to be pretty standard among US service providers. But when I dial *70 on my phone, I immediately get a busy signal.

By the way, if I receive a call, I should also be able to dial *70 while I'm on the call to disable call waiting so the call is not interrupted by another incoming call. So, it's important that I can pass a *70 command...