Cheapest way to test Three network for a day.

Considering the switch to Three in the next few weeks but want to try it out without spending more than absolutely necessary before I decide to switch. Only want to test the indoor signal strength and download speeds.
Cheapest top-up is£10 and 1 month sim is £9.90
Seller on eBay who sells the sim pre-loaded with £10 credit for £7.50 but even then I think it's dead money as I won't necessarily use any of that credit in next 30 days whilst I've still got my t mobile contract.
Gotta be cheaper solution, even with £1 credit.

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