Photos: Tomorrow's mobile phones--take a whiff

Students at Central St. Martins College of Art and Design in London have been coming up with designs for the biggest-selling phone of 2015.

This device, by Nicola Reed, is a third-generation phone with the dimensions of a credit card and is intended to be worn around the neck. It's green-themed and environmentally friendly--after analyzing its user's day-to-day impact on the planet, the climate conscious are rewarded with free calls and texts.

This design, called Scentsory, by Kimberly Hu, brings aromatherapy to a mobile, allowing users to share scents with each other, as well as other ambient experiences such as lighting.

With its origami-like folding mechanism, the phone can take the form of an envelope or a traditional thin candy bar phone.

Sungjoo Kim's Hello Phone is designed to breathe new life into outdated mobile phones.

Old school phones can be placed into the cradle, which acts as an extension of the device. The setup could, for instance, give users access to new services including home security applications, where pictures taken by a camera phone are broadcast to the Hello's owner via the Web.

This device, the Nokia 111, won designer Dan Meyer an internship with Nokia.

Based on the concept of travelers who would keep a locket holding a family picture on their bedside, this device swivels to become a picture frame when it's not being used. Its swiveling shape also means it can be placed on a table during video calls to simulate normal eye contact.

All of the devices and designs are now on show at the Air Gallery in London.