Your first mobile device may have cost nothing compared to modern smartphones of today, but that old "brick" could actually be thousands of pounds.

Antiques marketplace LoveAntiques.com has compiled a list of the most valuable "vintage" mobile phones with the highest price.

Topping the list is a rare version of the first iPhone - which is worth a staggering £10,000. There are also possible windfalls instore for those who still have old Motorolas and Nokias too.

The 10 most valuable mobile phones are:

Pre-production Prototype iPhone 1 - £10,000+

Motorola 8000x- £800 - £3,500

Nokia 7700 - £1,000 - £2,000

Mobira Senator NMT- £800 - £2,000

IBM Simon Personal Communicator- £800 - £2,000

Nokia Sapphire 8800 - £500 - £2,000

Technophone PC105T - £600 - £1,500

Orbitel Citiphone- £600 - £1,000

Ericsson R290 Satellite Phone - £300 - £1,000

Rainbow StarTAC - £100 - £400

Small factors like software, model, cult status and rarity are just some things that can make an old mobile phone valuable.

Experts say that the prototype iPhone 1 - has been known to fetch up to £30,000. However, many post-production iPhones have had different software installed - making them less valuable.