As 2G/3G networks are being shut down, MVNOs face numerous challenges, including the need to transition to 4G and 5G networks. One specific issue that arises during this transition is related to the IMS APN configuration.
When you provide services for smartphones, a mobile-first experience should be mandatory for those providers. Until recently, MVNOs and MNO in general did not care about it and the customer experience they provided was awful. If your are a MVNO or MNO and want to excel your Customer Experience you need absolutely to focus on mobile-first experience.