Step 1: To activate your Personal HotSpot on your iPhone, go to your Settings and tap on Mobile Data.
Step2: Next tap on Mobile Data Options. 
Step 3: From there, tap on Mobile Data Network, and then scroll down until you see the Personal HotSpot settings.
Step 4: Next, all you need to do is change your Access Point Name (APN) to webuk.mundio.com. No need to fill out any username or password. 
Step 5: Afterwards, head back to your Mobile Data menu, where you should be able to see and turn on/off your Personal HotSpot.
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