My phone is 14 years old, so no modern apps (especially the ones needing extra security) work there. In Ireland, we don't have a digital ID card, but there have been some equivalents:

• During Covid, we had a digital vaccination pass. However, it was possible to request a paper version, which was supposed to be accepted everywhere (it wasn't).
• Due to 2FA, many companies require a phone authenticator. Those companies that provide legally mandated products or services are required to provide an alternative to people without smartphones. For example, when I needed to renew my car insurance and couldn't do it online, the company had a phone number for over the phone renewal.
• There's currently a fight whether one of our airlines can mandate app-only boarding passes, effectively excluding people without modern phones. Since they don't provide essential service that's mandated by law, they argue they should be able to do so.