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Hi there and welcome
you will need to use a provider in order to get internet, but you can use a MIFI device and then connect to this, so you do not need to rely on the infrastructure of the house.
As your only for 3 months, you would best be using a contract free (pre-paid one)
You can use the Virgin Prepaid (CLICK HERE) as it offers the best average download speeds.
But you can see all the options available from different providers here
The best solution will depend on how much data and devices you wish to use.