No, you do not need to register multiple accounts. Just register for ONE login account. Once you are logged in, you can link all your other mobile numbers to it. This way, you’ll be able to manage multiple plans with a single access.   

Follow the steps below to add multiple accounts:  

Step 1: After login, tap on the Menu button on your homepage.  

Step 2: Click on the arrow next to your registered mobile number.  

Step 3: Tap on Register to Manage Your Other Numbers 

Step 4: Fill in your mobile number, email, full name as per ID, and password. Ensure all the details given are correct, then click on Register 

Step 5: And you're done! You can now manage multiple Digi Mobile Numbers with the MyDigi App.