Could not activate cellular data network

    HI ystd i bought prepaid sim card for ipad mini, had it activated at the shop, put the money in the account balance but decide to start using it today.

    After i inserted the sim card Today, it said the sim card is already active on a subscription that cannot be managed in this device. I tried to access the internet but couldn't as it said could not activate cellular data network.

    moreover, i've notice that if i order prepaid sim card online it charges only $1 for the sim while i paid $10 for it!