The KX_TGA204C handset is compatible with a few different Panasonic cordless phone bases, including the KX-TG4011C. Unfortunately, you can't block incoming calls at the phone. This phone system does not have a Call Block list option. You might be able to get your telephone service to block incoming phone numbers for a fee.
The directions for using the handset are in the manual for the phone system. Panasonic has the manual here:
ftp://ftp.panasonic.com/telephone/om/kx-tg4011_mul_om.pdf . ManualsLib also has the manual here:
https://www.manualslib.com/manual/854052/Panasonic-Kx-Tg4011c.html?page=3#manual .
I wish that I had better news for you. To see some Panasonic cordless phone models that include the Call Block feature, see http://shop.panasonic.com/cordless-corded-telephones/cordless-telephones#prefn1=features&srule=newest&prefv1=Call%20Block&nextIndex=0 .
Cindy Wells
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