Sennheiser Sonite R. And which phone

Sennheiser is Phonak which uses classic Bluetooth which is used by Android. Many iPhone users also. I use Samsung with my Phonaks.

I have used my Phonak with my iPhone and my Android . The connection is solid because Phonak has universal Bluetooth connectivity and can connect to anything that has Bluetooth the same way a regular headphone can connect .

As @raylock1 said , Sennheiser is a rebadged Phonak.