If you use a phone case to additionally protect your device, it's possible that it is weakening the Wi-Fi signal, especially if the phone case contains metal in it. Check if your phone case is blocking the Wi-Fi signal by removing it from the mobile device.
If the phone case turned out to be the culprit, buy a new, silicon-free case.
Check out the don't know which phone case to buy guide if you are unsure where to buy one from.
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