Here is a flexible iPhone tripod that lets you get more creative with your smartphone camera. The JOBY PodZilla Tripod has a built-in ball head and 1/4-20″ thread mount. It can handle 1kg load. This tripod has aluminum core covered with grippy rubber.
The PodZilla has a convenient bubble level. It ships with a phone clamp with two cold shoes for your microphone and lights. You can also use it with your GoPro camera.[where to get it]