Yes, you can use the router with a prepaid card from Coop Mobile. The router supports the use of SIM cards from different suppliers as it is designed for universal compatibility with 3G/4G LTE SIM cards. You can simply insert the prepaid SIM and use the router without having to make any special configurations. The fact that with Coop Mobile the data does not expire after 30 days is independent of the router and only affects the mobile phone contract or the prepaid card itself.