What can you do if people don't have ios 13

[Josh615]

I have several people on iPhone who aren’t able to download the app since it takes ios 13. How can I get people on this when it isn’t compatible with their version?

[DuoPablo]

Hi @Josh615 - End users who do not possess a compatible (minimally supported device/iOS version) can still authenticate via Duo using SMS or phone callback.

Which versions of iOS does Duo Mobile support?
Using Duo With Any Cell Phone or Landline