How to stop duplicate mobile number in the time enter mobile number

How to stop duplicate mobile number in the time enter mobile number

@gopal_mani, could you kindly provide more details so that the community can also help you if it’s possible through KoboToolbox?

Hi Kal,
We are collecting so many respondents mobile number in the time data collection. If any data collector entering Mobile number in the proper box, suppose he is entering any number, which was already in the name of any other respondent. In that situation we get a alert this mobile number already in the data to avoid the duplicacy

@gopal_mani, you could do this using the dynamic data attachment feature as outlined in the post discussed previously: