Roamless currently does not offer auto-renewal for your data plans or auto top-up for your pay-as-you-go credits balances.
If your balance is low on pay-as-you-go credits, you can top-up manually with as little as $5.00 USD
If your data plan is running low on data, you can buy another data plan, which will automatically kick in once your current plan runs out and keep your connectivity uninterrupted
Auto top-up is a feature that's currently being developed, which we plan to release in a future update. Please stay tuned.