9to5Mac quotes KGI Securities analyst Ming-Chi Kuo saying that in iPhone 7 dual camera, the OIS is installed only on wide angle camera:
"Note that for the dual-camera of iPhone 7 Plus, wide-angle CCM is equipped with optical image stabilization (OIS) VCM, while telephoto CCM only comes with general VCM. We believe the focus of the dual-camera upgrade will be equipping telephoto CCM with OIS CCM, so as to significantly enhance optical and digital zoom quality."
MacRumors too quotes Ming-Chi Kuo research note:
"While an attractive addition for avid picture takers and professional photographers, the iPhone 7 Plus dual-camera is not a mass-market killer application yet. Along with its high cost (estimated at over US$30-40) and the necessity for Apple to enhance the added value of high-end iPhone models, we expect only high-end new iPhone models (30-40% of them) to have a dual-camera next year."