Simulate different network conditions on iOS simulator

When enabled, the Network Link Conditioner can change the network environment of the iPhone Simulator according to one of the built-in presets:
  • EDGE
  • 3G
  • DSL
  • WiFi
  • High Latency DNS
  • Very Bad Network
  • 100% Loss

You can control the internet downlink/uplink bandwidth. BitTorrent/UTorrent some times won’t respect the upload limit so network-link-conditioner will control it.

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how to uninstall unnecessary simulators in Xcode?

You can find and delete the simulators from the path /Library/Developer/CoreSimulator/Profiles/Runtimes. Restart Xcode in order to take effect.

or

You can delete a simulator from Xcode by navigation through Menu > Window > Devices > Simulators.