Sometimes the small things are the best. CardNinja is a simple yet effective "wallet replacement" - or more of a card pocket really - that can stick on the back of most smartphones or cases.

We know you're probably already thinking that your cards will fall out, but CardNinja has a sensei-like grip that can hold in one card or a whole bunch. We not only held it upside down, we positively jiggled it around to see if a lone Visa would go flying. But it didn't.

The adhesive pocket won't stick on to rubber-like surfaces, so some cases and the odd phone won't be compatible, but most will. Once it's on it's solid too. We gave it a good tug to try to peel it away from the phone case, but it stayed put.

We can see a lot of practical use for the CardNinja: Subway or Oyster cards needn't go missing again; bulging wallets needn't be seen protruding from back pockets; or when you've got those dancing shoes on it offers a practical way to cut down on what you're carrying.

Available in black, grey or purple, the CardNinja smartphone wallet costs $20. International shipping is available direct from the CardNinja website as there's no current distribution outside of the USA.

ee.co.uk - PAY MONTHLY PHONES The Samsung Galaxy S10+ is now available on EE who have been awarded the UK’s best network for the fifth year running. RootMetrics tested the four UK networks and EE was faster and more reliable than all of them, with better data performance. Their network has come a long way since they launched in 2012. Back then they had 11 UK cities covered by 4G. Today they cover most of the UK’s land mass, thanks to 19,000 state-of-the-art 4G sites. They’ve got faster, too – from 50Mbps to a maximum speed of 400Mbps. And they’re soon to experience even greater possibilities with the launch of 5G.

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