Admob smartBanner height issue in iphone (ios v9.3)

Hello everyone,
We are using admob sdk for ads in our unity game for ios. Issue is with the smartBanner height in iphones. In ipad smartBanner ads are looking perfect, but in iphone devices smartBanner ads are clipped due to small banner height. We are using Unity 4.7.2f1, admob sdk v7.9.1 and ios v9.3 on both ipad and iphone.

source code:
BannerView bannerView = null;
bannerView = new BannerView(bannerAdUnitId, AdSize.SmartBanner, AdPosition.Top);

screenshots are attached for reference.