To integrate Meta Ads with Google AdMob bidding on iOS, you first need to install the Meta Audience Network SDK along with the AdMob SDK using CocoaPods, then enable bidding for Meta Audience Network inside your AdMob account. After that, you must add Meta as a bidding partner in AdMob mediation settings and include the correct placement IDs and app IDs from Meta Business Manager. In your Xcode project, configure the adapters, initialize both SDKs in the AppDelegate, and make sure SKAdNetwork IDs from Meta are added to your Info.plist. Once everything is set up, load and display your ad units as you normally do with AdMob, and the system will automatically handle bidding between Meta and other networks.