Would this be able to charge a usb device, such as an iphone, if plugged into a home's rj11 land-line phone jack?

NO! This is only to attach special 1-wire sensor networks using rj-11 plug to a USB port on a computer. This is not a phone device.

Would this enable serial data transfer directly via the usb? have a device (pinewood derby timer) that uses rj11 output. want to skip the dongle.

You want to look elsewhere. The DS9490R# adapter is used for communicating with 1-Wire (a communication protocol) devices over USB. The RJ11 is just a reference to a generic connector used by many devices like old land line phones and the DS9490R#.

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