Hi, I'm on a 30 day rolling SIM only contract where I pay £10 a month, I noticed your doing double data at the moment for the same cost, so I've added it online but it doesn't make it clear if it's just for the ONE month or every month?
"Offer available on our SIM Only or Freestyle Contracts (including Pay Monthly tariff) on any phone. Offer ends on 5th September. Double data offer is available on the £8 airtime tariff (monthly allowance of 1GB is doubled to 2GB) and the £10 airtime tariff (monthly allowance of 2GB is doubled to 4GB). You will continue to receive the increased data allowance specified for as long as you remain on the same tariff. If you change your tariff up or down the double data allowance will be removed. No other discounts or promotions may be used in conjunction with this offer unless Virgin Media states otherwise. Offer only available online"
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