HRM bluetooth

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I have a Zephyr hrm which I have had for several years. I noticed last weekend that my heart rate was not coming through on Endomondo. It so happens I dropped and trashed my phone on Sunday and received the replacement on Tuesday. The monitor paired with the new phone, but no heart rate on yesterday's bike ride.

Last nite I washed the strap so I will see if that cures it.

So 2 questions:

Any suggestions on another way to test it?

If I have to replace, what are you using and what do you like or dislike??

I liked the Zephyr well enough though it is a little bulky under my sports bra band. But it gave me a good long life life so I can't really complain.