I have an iPhone 6S, and I have contacts in gmail and iCloud and they both show on my phone. I have a lot and want to clean them up - remove ones I don't call often and ones that have email address only without a number. For the gmail ones, I can either do it from my laptop, in gmail.com, or on my iPhone direct. What's the best way to do this? How do they get synced? Can I force a sync to occur?