My wife and I purchased two of the S9+ and we both experience the speaker phone issue. It is discouraging to be experiencing a problem that others have reported existed on their last generation Samsung as well, what does that say for the hopes of seeing a fix? I'm new to Samsung and so is my wife, she's new to Android infact, I came from a Pixel. So far I've experienced more technical issues with this big beautiful phone than I care to admit, total lockups, app crashes, etc, that I'm having a hard time not getting frustrated.
The thing is, at the core of everything this thing does, being a phone is still it's primary function so I expect it to do it very well. Speaker phone is a super basic function and in a $850+ phone (heck in a $50 phone) I expect it to work. We use it all the time (or should say used to) and now we just can't use it. It literally sounds like the person on the other end has two bags wrapped around their head, is standing behind glass and trying to talk threw it, absolutely unintelligible.
Things I miss about my Pixel:
OS stability and regular updates, it never locked up (this does maybe twice a month requiring hard reboot)
Speakerpone worked.
Autocorrect/Predictive text on stock keyboard actually worked (this one corrects real words to nonsense).
Camera could take pictures of moving objects (this one is amazing but even the slightest movemdnt results in a blur)
Google Assistant baked in and seemingly more reliable to voice commands (Bixby sucks! I mean better than Siri but not a tall bar).
Built-in Visual Voicemail on the Phone app. (Have to use Verizon's app)
Admittedly my list of things I like better about this phone is larger than my list of cons but technical issues seriously erk me.
Thank you Samsung for not killing the headphone jack, it's the primary reason you won me over, now just fix my short list and this love affair can continue for generations.