How do we collect telephone numbers which start with a leading zero?

[Kal_Lam]

You could follow this workaround discussed previously (it should solve your issue):

Confirm E-mail

Maybe you could do it as outlined in the image below: In the survey tab of your xlsform: [Image 1] Data entry screen as seen in Enketo: (when a wrong entry is made) [Image 2] Data entry screen as seen in Enketo: (when a correct entry is made) [Image 3] Reference xlsform: Email Constraint.xlsx (10.2 KB)