I noticed my phone wasn't counting steps accurately because I don't carry it around at home. I put it on a cheap pedometer around 8pm before we went for a walk. I didn't take it off until just now and it counted 6410 steps. Jason and I took the dog for a walk for about 40 minutes.
Ha ha! We did a challenge at my gym back in January that involved measuring distance traveled in the day. I realized I'd left my phone sitting the whole day lots of times. I feel your pain!