Hello & Welcome to Just Answer,
Sorry to hear of any issue you may be having with your phones or handset.
May I ask:
1) Does the handset that does NOT work in speakerphone mode "ring" - when a call comes in?
2) Does it still work well when NOT in speakerphone mode (that is, using the EARPIECE)?
3) Do you still have (or can find) the receipt for the original purchased package?
I see it has been a few days and I just wanted to follow up to see if you have any more questions concerning this issue or if the issue was resolved?
I look forward to any further questions or results that you may have.
Thanks, ***** *****--. .-(im)