The way you phrase your question makes it sound like you’re used to hearing your own voice when engaging in phone calls. What are you doing differently with the Samsung VS your regular phone? And (assuming the difference is switching to the telecoil setting) why are you doing that with the Samsung and not doing it with your current phone?
Since a telecoil doesn’t actually pick up sounds (it picks up changes in magnetic field near the hearing aid) a telecoil is able to “hear” a telephone speaker, but cannot “hear” most other sounds in the room (such as your own voice).
As others have mentioned, you need something that will pick up sounds in the room (such as a telecoil + microphone mode). If you go that route, some manufacturers allow you to control how much gain is applied to each signal, which might allow you to find a balance where there’s enough input from the mics for you to hear your own voice, but not enough for other environmental sounds to overwhelm the input from the telecoil.