Best answer by Dennis
It means they didnt use the referral in time and the link you gave them is no good anymore.
How long are referrals valid?
Once you receive your referral, you'll have 30 days to redeem your offer (by entering your name and email address into the referral system). After you've redeemed your offer, you have 30 days to: (1) buy a phone or SIM card and activate on a postpaid rate plan; and (2) log back into the referral system and provide your mobile phone number. You can find the link to enter your phone number in the confirmation email you received after redeeming your offer.