one of my prepaid cards ("xtra" by t-mobile)
has got the "nonstop option" additionally bookable for €1.50 pm
(one month minimum only) then you pay only for the first minute
of every call 29 cents, and merely talk endlessly - also just 29 cents
for the first sms of a day, then 100 sms free on that same day.

the card is by default without monthly fee
and charges 5 cents per minute or per sms.
I'll use the nonstop option only if my job keeps
me (as recently) away from home for a few weeks.
it is in my old n 95, while for my samsung
I still prefer the postpaid with all the benefits
as specified in my first comment here, above.