Q: Problems sharing internet to macbook over wifi and bluetooth

I have an iPhone 5S with iOS 7.1.2 and I want to share its internet connection to a Macbook Pro (early 2011) with OS X Mavericks 10.9.4.

When I share using USB connection, it works fine, but with Wifi and Bluetooth I have some issues:

- Bluetooth: I have never been able to make this work. I can't pair the iPhone with the Macbook. The iPhone appeared in the list of bluetooth devices in my mac, and I tried to pair it; in the iPhone a dialog asked me to confirm if I wanted to pair with the mac, and I selected Yes. After a few seconds it disconnected. If I try to pair from my iPhone to the mac, I get an error message "Device not compatible".

- Wifi: this sometimes works but is very buggy. Sometimes the iPhone wifi network is not visible to my mac. Other times, when I select the wifi network in the mac, I get an error message that says it was not possible to connect. I have to turn off/on the wifi and internet sharing in the iPhone several times to make it work.

This is all very frustrating. Is there a way to fix this?