Show mid shot of box sat on a doorstep/porch. Use soft lighting to indicate Jas' happiness of the arrival.
Jas decides to block the contact
Jas plays with her new phone; she immediately turns it on upon discovering that it has been delivered and comes across the strange apps - Dielling Time, Wi-Free, Limbo. She brushes them aside but show close up of Jas' face, which is slightly concerned.
News article shocks Jas
Close up shot of both the phone and of Jas' face. Use darker lighting to show danger and fear. Show other texts arriving across a short period of time; the texts may be odd and slightly concerning but not yet aggressive or mysterious.
More messages appear
Use combination of aerial and close up shots to show Jas blocking the number, only show contact name as Emma Walters.
Jas walks into living room to discover news show on the television is giving a shocking account of the disappearance of Emma Walters. Close up of Jas' face as she realises the name matches up with the blocked contact on her phone. Jas looks at her phone and turns it off in a bought of panic.
Dark lighting to indicate danger. Jas receives more sinister messages from unknown numbers. The contact name is saved under 'Sam Thompson'. Close up shot shows her fearful face. She uses a search engine to identify this person, and is shocked even further to find a picture of someone in her school's uniform on a local newspaper's website. Sam has recently been involved in a large crime.