Any recommendations regarding the best Data only pay & go SIM card to use in a mobile WiFi unit. It would only be required for use occasionally .
Thanks
If it's for occasional use, then longevity of data is just as important as the initial price.
Look for a PAYG sim where data doesn't expire after a given number of months - Tesco certainly used to do one (I've got one in a spare phone & it's lasted pretty much forever).
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