SumUp, the London-based payments startup, today launched the SumUp 3G Reader — a card terminal that lets merchants process payments without the need for a mobile app or a constant Wi-Fi connection. Previous iterations of SumUp’s card reader hardware required users to tether the device to either a smartphone or tablet via Bluetooth. This approach has one major disadvantage: if your phone runs out of power, or you forget to bring it with you, you’re unable to take card payments. As the name suggests, the SumUp 3G Reader comes with an integrated mobile data connection, allowing merchants to take payments…

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