for idigi plan, the free call/sms/data are for primary line only! cannot shared!
exampe idigi88, only primary line got 200 mins to call to any number exclude his/her supp line number.

for dg family, the free call/sms/mms are between the primary num and supp line num. call/sms ur supp line number as much as u want.

and, idigi88 normal monthly fee is rm88, idigi138 is rm138, while idigi238 is rm238.
ur digi bill and credit card bill definately are not same billing date.
ur digi bill can be 25th each month, while ur credit card statement date is 4th each month.
wait for ur digi bill later, it should stated that bill already paid on <date as stated on ur credit card bill>.
sure u can. no prob. u can even sign up for EPP if ur bank is supported.