Samsung Galaxy Z Fold4

if anyone knows how to correct the problem i go to a building that a unsecure wifi signal i cant make or receive any phone calls or messages. As soon as i am outside the store i can make receive send messages i called my phone carrier and they cant seem to help me resolve this problem i do have 5 g service on my phone

No stylus slot. So, no reason to upgrade from Fold3. Concerns about battery size ridiculous. Just make phone bigger. Outer screen would be better, inner screen would have better aspect ratio. Smsung has a case that holds a stylus, but its very bulky and had the stylus holder on the back, so good luck using a dash-mounted phone holder. Why not just make phone a little wider? Short sighted.