If you have an android phone, you can download an app called FoxFi. There is a one time purchase fee but after that it unlocks use of your phone's wifi hotspot feature without having to pay your carrier a monthly fee. Any data used with this app is billed against your month data allowance.
I am fortunate enough to have been grandfathered into an old Verizon unlimited data plan so I use the FoxFi app freely when travelling or at home when the wifi goes out.
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