如何使用移动浏览器上的按钮拨打USSD代码

Question

I am trying to dial a USSD Code using this code

<button onclick="document.location.href = 'tel:*556#'">Check balance</button>

but is not working on mobile

Answer 1

You should rely on anchor tags for that since you want to open another app via a hyperlink.

Using the following should work for you

<a href="tel:*556%23">Check balance</a>

%23 is the the url encoded value of # . The rule of thumb is to encode the url of your link (number). You can use encodeURIComponent('your-number-here') to do that