Question about Digitec iot Data Flat

3-4 questions before investment on some unclear points that might interest many; - Once the term is up (30 days or 365 days), is the SIM card automatically renewed and billed to my Digitec account, or do I have to change it? I can't see myself going to change the SIM on my masthead every month, or even every year. - Can the payment be made on invoice or does it have to be made in advance? - Normally an ID card is required, but the SIM card can be registered under a company name and rather than a personal ID card, would a trade register extract suffice? - I have a lot of customers who are underserved by the wireline network (copper/coax/fibre) and I plan to switch to 4G/5G with directional mast antennas. I've done some trials with Lebara/Yallo/Salt/Swisscom but the problem is billing the end customer. With this system, I could take everything under control and the customer would not have to do anything himself? - If I read correctly, the operator is Sunrise, but what is the APN? Is it Sunrise or is it Digitec? In my experience, when the antenna network is overloaded, the "sub-operator" APNs are not given priority and have their speed throttled or worse, switched to 3G. Again, from experience, the 300mbps Lebara never offers this speed, even with a directional LTE Cat.18 antenna pointed at the Sunrise mast... - The mobile network in Switzerland is a mess compared to European operators. No IPv6. NAT444 galore (CGNAT). It is extremely complicated to use it for VoIP or to host services that need to be accessible from outside the connected site without VPN tinkering. Can this operator provide fixed or non-CGNAT IPv4 addresses (public addresses)?