What happens to my current active bundle and calling credit when I switch to a subscription?

Your current active bundle remains valid until its expiration date. If you text or surf, you’ll use that bundle first. Only when it’s exhausted or expired, you’ll switch to you using the bundles of your subscription.

Because you can only have calling credit on a prepaid SIM card, your balance expires immediately when you switch to a subscription. Do you have a lot of accumulated calling credit? Check your payment settings to see if you have an automatic top-up and switch it off. Next, use up your calling credit before switching to a subscription. This only takes a few clicks in your SIM settings