ur welcome clkok

ur hotlink, is it youth club?

if yes, actually both ur hotlink yc and celcom uox is not expired at all, its just the service plan thats expired.
both will be automatically convert to normal prepaid, so yes, u can keep the number as prepaid.

only, the validity of airtime/credit after this is based on ur reload/topup amount, or based on ur yearly subscribtion fee (which is, a waste for me, unless, u staying oversea).

the cheapest to make expiry date longer, is port to umobile.
coz umobile validity is 3x top-up amount. rm10 is for 30days, rm30 for 90 days, rm50 for 150 days, or rm100 for 300days.

http://www.u.com.my/prepaid/free_sms_and_calls - look at 3x longer credit validity

prepaid termination date is usually 90 days after expiry date.
of coz, within that time, u can still receive call & sms.
but usually we will, at least, make a call & sms within 90 days.
so by default will top-up the credit, even for just rm5

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Added on October 30, 2012, 6:21 am

waze used very little data
whatsapp data usage depend on content. watching video for sure eat more data than text only
Unlimited call still have limit like 1,000 minute or 9,999  minute not sure.

you may look telco unlimited call plan with some data like digi prepaid 28, onexox black, redone, tune talk, giler 50 etc