NETWORK ISSUE

Same issue here for past 2 months on IPhone 8plus IOS14.3. I removed my VPN and the McAfee security app from my phone and now the 4g work intermittently. I find that every time I want to use 4g I need to toggle AirPlane mode on and off just for it to connect. It will usually only load like 1 webpage and then I have to toggle airplane mode again to restart the connection. Phone calls also frequently drop out. I change carriers twice, thinking it was them, but my carrier sims works perfectly in other phones. However on my iPhone it continually shows 4bars of signal until I make a call or connect to 4g; then it drops to like 1 bar -> SOS -> no network -> back to 1 bar and so forth. Really annoying.