The top panel's controls are for Bluetooth pairing, phone call answering (yes, the MP260 can be used as speakerphone), track forward / backward, Play / Pause, and Volume. (pcmag.com)
When on speakerphone calls, the recipient has some problems hearing what the caller is saying, with lots of echoes, high - pitched sounds, squealing voices and many other distractions to the calls being heard instead. (nashvillechatterclass.com)
This Pioneer head unit ($ 89) can do the job just fine, and it even comes with a small corded microphone that you can use for speakerphone calls. (howtogeek.com)