Phone numbers not complete in KoboCollect

After creating and deploying forms via ODK Android, I discovered that the Forms are not allowing complete 11 digit phone numbers to be inputted.
All attempts to input the phone number stops at 8-9 digits instead of 11 digits in my country Nigeria.
How do I correct this setback?

Welcome to the community, @governalert! Maybe this post discussed previously should help you solve your issue: