Thank you for coming up with this practical issue/challenge while collecting data with the Collect android app.
While collecting data with Enketo i could observe that users are able to enter a 16 digit integer comfortably (which gets stored it the KoBoToolbox server) in the system however while collecting data with the Collect android app users are only able to collect 9 digits.
As a temporary workaround you could do the following:
Design your survey project with the following question settings (question type- text; appearance- numbers). Doing do you are able to collect an integer with the desired number you wish. you could also use the regex in the constraint to control the number of digits that you wish to control as outlined in the post discussed previously:
For a permanent solution:
In regards to the 9 digit constraint that is seen with the Collect android app, maybe @Xiphware could be in the best position to answer your query. Kindly please let me know @Xiphware if I should create a GitHub issue for this. TIA!
