So you’ve signed up for an expensive all-you-can-eat data plan, yet when you try to tether your laptop to your phone to use that 4G connection you paid a premium for, you are stymied. Carriers will try to charge you $20 or $30 a month for tethering privileges. If you are using your laptop for business, wouldn’t it be smarter to stay on a 4G network rather than connecting to an open Wi-Fi one? On iPhone, tethering is a no-go. On Android, tethering may technically violate your user license, but you can do it with apps like Clockworkmod’s Tether. Tether costs $4.99, but one stay in a hotel that still charges for Wi-Fi will make this app a no-brainer.