Have you bought another handset
No, it is the original one.
This is silver gray, while I remember your handset was black.
I have changed a case for it.
Can a handset case be changed?
Of course. That's why I bought this type. I can change its case frequently, so it is novel to use it.
How many cases are accessible?
There are two more, one is orange and the other is pink. I have bought them all.