Since there is no dialer on your child's monqi phone you will need to add the operators top-up phone number to your child's phone (in some cases they come pre-loaded and approved). To do that you must follow these steps:
1. Open your parent app
2. Go to your child's contacts
3. Add a contact - in this case ID's number 7777
4. Switch to your child's phone and now dial 7777 or send a text if needed.