In the case of Saunalahti Prepaid, unfortunately not.

Saunalahti Prepaid is what it is. You cannot port the number to another operator, either.

Hello

I have a prepaid simkart, can I convert to postpaid? How can I do that?

Postpaid plan in cheaper than prepaid? 

Unfortunately Elisa Prepaid cannot be changed or ported.

Postpaids are cheaper only for the duration of a special offer.

Normal prices for postpaids are generally a bit more expensive than their prepaid counterparts. However, it is quite difficult to compare the different options, as the packets and validity periods differ between postpaid and prepaid offers.

For example, the cheapest invoiced 5G option Elisa 5G+ Rajaton 300M is 37.99 €/month, while roughly similar prepaid packet 5G Rajaton 300M 34.99 € / 30 days makes on average 35.50 €/month.

4G options are so wildly different, that it is next to impossible to compare them. Postpaid Elisa 4G Rajaton 20M costs 30.99 €/month, while far faster prepaid package 4G Rajaton 100M 29.99 € / 30 days makes on average 30.43 €/month.

Every now and then there may be special offers for prepaids, too. Mind, that special offers on the online prepaid shop are shown only after you enter your prepaid phone number.