I have an iPhone 5S. Recently I installed a fitness app called "MyFitnessPal". Amongst other things it reads the phone's M7 motion chips to record your steps. However, I cannot work out how its calibrated. The MyFitness support people were unable to help me with this. According to it, today I walked about 1,000 steps. Thing is, I've been stuck in the house for most of the day and only walked about 50 metres (or yards) when I had to go out for a while. Also, where's the best place to have the phone; pants pocket, shirt pocket? Thanks.