Zte WF721 - Checking the Wireless Signal; Signal Strength Check; Connecting the Device to a Phone; Phone Connection

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 Put the device at least 2.5 meters away from the connected
phone, TV sets, radio and other electronic devices to avoid
electromagnetic interference.
Place a Test Call
1. Place a test call from your connected home phone. Before making
a call，Make sure to use 10-digit dialing even for local calls.
2. For best results, place the cordless phone base at least 12 inches
from the Wireless Home Phone Base. Lift the handset of your
home phone, enter the telephone number
Note: Keep your cordless phone plugged into a power outlet.