The Silicon Labs Bluetooth team maintains a number of mobile devices that we use for interoperability testing of our stack and mobile apps. The list of these devices is as follows
iPad, iPad mini2, iPad Air 2, iPad PRO,iPhone 4S, iPhone 6, iPhone 6S,
Samsung Galaxy Tab S, Nexus 5X, Huawei Mediapad M3, Samsung Galaxy S6, OnePlus One, HTC One M8, Samsung Galaxy Tab S3, Google Nexus 7 (by Asus), Galaxy Tab A, Huawei Nexus 6P, LG G6
This list isn't any sort of endorsement, it is only intended to be informative.