I'm writing a contemporary portal fantasy, that begins in semi-modern day London, I haven't indicated the exact year, but it is contemporary London. Now the MC is going from real world to fantasy world, my question is mentioning she has to leave her mobile/cellular phone at home because they won't work in the fantasy world a bit off putting or corny, doesn't it ruin the fantasy aura, bare in my the new world she'd going to has this hybrid advanced utopian landscape.