Beltone Marq and cell phones

We have just purchased Beltone Marq hearing aids for my 18 year old son. Now we are trying to buy a new cell phone for him that will be compatible with the new devices. Any advice out there? Thanks!

Just make sure the cell phone has a rating of M4 or T4. Those are the compatability ratings from the FCC. The higher the number, the better, so M4 is better than M3. M=microphone, T=telecoil coupling