My daughter’s plan is $35/10GB.
This month she used up all the data and has purchased three add-on of 1 GB each time for $75 in total!
her current billing cycle will end the day after tomorrow. can she change her plan now to $50/40 GB now?
If she can do so, can the new plan take effect immediately so that her monthly fee becomes $50, but she won’t be charged $75 for add-on?
Your advice is most appreciated!