Can we use zigbee in mobilephones instead of bluetoothg?

Answer 1

Zigbee isn't really suitable for use in mobile phones.

Zigbee is a specification for communication protocols and digital radios used in wireless monitoring and control systems. In very simplified terms, the specification states that a Zigbee device must use very little power, have a relatively low data transfer rate, and must be powered by batteries that are not rechargeable. In fact, a Zigbee-certified device must run at least 2 years before battery replacement is required. (There are many other features, but I won't go into those here.) This makes Zigbee ideal for remote sensing and data collecting applications, where in many cases the units can't be reached easily to replace batteries.

In contrast, Bluetooth is designed for higher data rates (4 times the maximum rate of Zigbee), longer range (up to 100 metres), and relatively frequent recharging of batteries. This is what consumers have typically come to expect from devices used for short-range wireless data transfer.

So .. while Zigbee and Bluetooth are both short-range wireless specifications, they are designed to be used for very different purposes.