Nope, you don't understand the subject about which you are writing.
The longer term plans are "Ready SIM". SIM pack with a preset bundle.
The monthly plans are simply normal SIM, with the vendor applying a USSD code supplied by the network. That's why they you see the six extra digits appended to the codes, to identify and incentivise the vendor.
No need to purchase online in that case, as it takes extra time for nothing. Though no harm in doing it if you want to do so.