In notification bar, I saw an unusual icon in my Galaxy A21s. It's like a telephone  icon with a WiFi sign over it What does it mean?

What measures do I need to take to make my phone faster. It is slowing down nowadays. 

I'm having a problem in my phone,Galaxy A21s. Since, I have upgraded it withAndroid 12, it got a bug. The bug is, whenever I exit any app while a video was running, it's audio keeps playing in the background. For example, I just exit WhatsApp while w...

Over the past few days, I noticed that my Galaxy A21s doesn't catch signal when I keep it inside my jacket. As soon as I take it out, I start getting notifications. 

     Guys, let me know if you're facing the same issue.  I'm facing a bug with my WhatsApp (ruunning with preloaded Dual Messenger) recently upgraded my Galaxy A21s with Android 12 One UI 4.1When I open a group chat with many unread messages, it show...