Check Your Case
Using certain cases can have an impact on your iPhone’s Wi-Fi signal strength. This is especially true if you’re using a case as a wallet that’s stuffed with credit cards.
Metal money clips and any case with a magnet could be interfering with a Wi-Fi signal, although MagSafe cases are generally okay as these follow Apple’s specs, which keep the magnetic ring well away from the Wi-Fi (and cellular) antennas.
Most cases today are made of plastic or silicone, which generally don’t create issues. If you’ve been struggling with Wi-Fi signals and have a bulky case or a case with metal or magnetic parts, consider changing your case. These same cases will likely impact your Bluetooth and cellular signal strength as well.