That is really a good question, straightforward; Jawwy Flexible Plan is the monthly plan that consists of minutes and data for local usage, it is renewed every month. You can also downgrade/upgrade your plan at any time, or even share its benefits within the numbers in the same account.
On the other hand, Jawwy Combos are one-time purchase bundles and not recurring on a monthly basis. Yet; you can keep sharing their benefits across your Jawwy numbers except "Unlimited Social Pass of Combo-150.
