Sorry for any delay in responding - I was having connection issues.
For this issue of NOT hearing the phone ring for incoming calls, there are a couple of possibilities:
1) The ringer is turned OFF or is set VERY LOW.
To TEST for this, pick up the handset and look at the display - for a TINY ICON that looks like a "bell with a line through it". If you see that, that means the ringer is turned OFF, and it will need to be turned back on. I have attached an image that shows how to adjust the ringer volume of the handset.
2) The "speaker" in the handset may be failing (or handset batteries are getting very weak).
To TEST for this, find the "Locator" button on the MAIN BASE UNIT of the system, and press it one time. This SHOULD cause the handset to beep for 1 minute - through the speaker. If you do NOT hear the beep, that would indicate a failing speaker. OR if it beeps LOUDLY for a few seconds and then fades to low, that would indicate failing batteries in the handset (they would need to be replaced).
3) The phone service provider is not sending the "ring signal" to your phone, OR the signal is very weak.
The TEST for this is to call your home line from a DIFFERENT phone (such a mobile phone or neighbor/friend phone, OR call someone and ask them to call you back). If the phone does NOT ring or have ANY indications that someone is calling (such as the display turns ON), then we know this is a service provider issue, and you will want to contact them and report this issue right away - so they can look into it.
Please give these things a try and let me know your results.
And when you are ready, please take a moment to rate my service level (Excellent is my goal) so that I get credit for helping you today. You should see some "smiley faces" or "stars" to do that, but please let me know if you do NOT see them or can not use them.
Thanks, ***** *****