One idea that springs to mind is that by that time, the Wizardry World has adopted something resembling cell phone technology. An enchanted wall phone (or one of those candlestick ones) pulled out of a bag would provide some comedy as well.
Lets face it, wizards can hardly consider magic better than technology if they can't even think of a decent way to replace the cell phone; by 2025, muggles will be able to communicate with the hospital via thought-waves; let's hope that wizards have come to at least 1980's technology.
Or just use a cell phone. I imagine a conversation to be like
1: We need to contact St. Mungos now!
[2 pulls out her cell phone]
1: What the bloody hell is that?
2: A cell phone, dungbrain.
[1 gives 2 a doubtful look]
2: Well do you have a better way, Mister Wizard?
[1 looks ashamed at his inferiority to muggles]