-You can use your own password
-Password won't be changed by other users, you own the ID

Can you confirm the id password won't be changed even by the school? If it got changed, will I received new replacement id?

Can you confirm how much data is guaranteed per month? e.g. If I only use twice no more than 500mb, and suddenly quota finished within a month, will I get a new replacement id?

If both can be confirmed, please send payment details.