How to Block Calls on phone - Yuanj phone Call Blocker

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Block calls from Telemarketers, prank callers, political calls, collection calls, and other nuisance calls with the newest version of the T-Lock / Pro Call Blocker (Version 2.x).
The simple press of a button stops unwanted call blockers in their tracks.
It can block up to 50 outgoing phone numbers, area codes, and prefixes.
Stores up to 100 most recent incoming call records with date and time.
Stores up to 50 most recent outgoing call records with date and time. Compatible with FSK/DTMF, PSTN landlines, and even VOIP services.

Key Features:

High Volume Blocking Capacity
BLACKLIST up to 1,500 unwanted phone numbers and area codes
One-Button Operation
It's easy to install & use - simply setup and start blocking numbers!
Compatible with Existing Phone Services
It works on landlines (PSTN, POTS), Analog/Digital/Internet (VOIP) Voice lines
No Batteries or External Power Required
It's powered by the phone-line, and requires no batteries or power supply
Non-Volatile Memory
It has a built-in memory to retain unwanted numbers even if disconnected

Technical Specifications:
Press ONE-button operation for blocking incoming calls
Block calls with no caller ID (On/OFF feature)
Automatically updates date & time (Month-Day-Hour-Time) with Caller ID of incoming calls
Stores most recent 100 incoming call records
Stores most recent 50 outgoing call records
FSK/DTMF compatible (POTS/PSTN landlines and VOIP lines) CE certified (Approved by the European Union Standards)
RoHS compliant (contains no hazardous materials)
FCC Certified