The original TV show "Who Wants to be a Millionaire" is recorded in studio some days before the actual broadcast. The show that we see in the film is broadcast live, which raises the incongruence that the person from home can easily see the question on TV, having plenty of time to come up with an answer before receiving the actual call. This explains the need to have the questions reread on the phone, and the credibility of the time limit. Moreover, the call itself is never directed to a mobile number, to prevent connection troubles, and for the same reason it's never issued directly when the contestant asks for it; the call is first made in the very moment the contestant begins his round and it's then kept live (but soundless) until the contestant calls for the hotline. As a side fact, after the hotline has been used the contact is still kept, so the contestant's people can hear live what happens from then on. However, this kind of show may have a 10-15-minute time delay.