"Top up of credit" is a term often used in the mobile telecommunications world, and it's quite straightforward. Essentially, it means adding funds or money to your mobile account balance.

Here's how it works:

1. Adding Funds: When you top up your credit, you're adding a specific amount of money to your mobile account. This money is then used to pay for calls, texts, data usage, or any other services provided by your mobile service provider.

2. Staying Connected: Topping up your credit ensures that you have enough balance to continue using your mobile phone and stay connected with calls, texts, and data services.

3. Prepaid Convenience: This is particularly common in prepaid mobile plans, where you pay for services in advance by topping up your credit. It gives you control over your spending and allows you to use your mobile according to your needs.

4. Auto Renewal: An added convenience is that you can use your topped-up credit to auto-renew your subscribed plan as per the renewal cycle. This means you don't have to worry about forgetting to renew your plan, ensuring uninterrupted connectivity.

So, think of "top up of credit" as a way to keep your mobile service running smoothly and ensure you can make calls, send texts, and use data whenever you need to. It's all about convenience and staying connected!*