What specifically have you been looking at?
You are aware that Bluetooth has about a 15-20 foot range? If you plan to use your 'phone' as the source, it MUST be within 20' of the Bluetooth receiver to operate.
I am not familiar with what products may be able to support individual volume control for multiple speaker locations without also including multiple source selection as an option.
Be aware that it is rare, and frankly stupid, to include source inside your audio distribution device.
WHY?
Because Bluetooth is on version 5.2, and will be on version 6.0 at some point. Then version 10. Unless you plan to rip down the house in the next ten years, or swap your audio distribution system every few years, why would you want the source built in? No, you want to connect a source of your choosing to the product and then select it from your phone's interface.
I often recommend the HTD solution as it gives you phone control and source select capabilities for a reasonable price, then add whatever source you want to it. Whether that's a generic Bluetooth receiver, or a better quality source like a Sonos Port or a Bluesound Node.
DetailsCat 5/6 cable NOT requiredIt is possible to control our Mid-Level and Lync whole-house audio systems from any iOS or Android smart phone or tablet using your existing WiFi network and our free apps. If the difficulty of running Cat 5/5e/6 cable to Keypad locations has prevented you from...
www.htd.com
It's about $1,000.
Not sure what else you've looked at, but post links and I can give my assessment of it.