WHATS APP WILL NOT CHANGE TO SPEAKER PHONE - Cell Phones

Your question is not clear as written.

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sir where you want to change your phone number?
delete your number from whats app then add new number.
other than you can take new number and send a message to all contacts you have .... i hope it helps you ... :)

Typically, What's app requires a phone number attached to a device for it to work. Most tablets don't have cell phones built in, so Whats app won't run on them, or even load onto them.
There are work arounds. Search Google for "Installing Whats App on a tablet or a PC". I have Whats App installed on a tablet, using my landline phone number, and it works over WiFi.

You are on the wrong website.

You must use the specific "Change Number" process to migrate to your new number as explained in this tutorial:
WhatsApp FAQ How can change my WhatsApp phone number

whatsapp is free but u have to pay 0.99$ per year for it

Simply first upon you connect the internet and then you check play store on your phone and search whats app then you download.
Free Cell Phone Unlock Codes Phone Unlocking Software

formate phone and scan phone for virus

try to custom reset the handset

*2767*2878#

& . OR

*2767*3855#

this will erase ur contacts on the phone and perhaps sms;s too that are stored on the phone memory, but it may just make the speaker work too.
if it stil fails, change the flex connector and ur phone speaker will work fine.

BR

check if the mute is on and off it or change the ear speaker