Ahh the Samsung SMT-i6021, fondly called “The Spaceship Phone” by Product Support.
We had thought it was impossible to put a lifter on this phone, but Sennheiser and a Customer of ours named Jason proved us wrong! See photo 2.
Please note the exact positioning on the phone. It’s unclear if the external microphone pictured is actually necessary.
If a Customer really needs remote answering, it is possible to successfully use a lifter on these phones!