Looking for auto redirection for Guest Social Portal like Voucher redirection

Below customer opened a case and he would like to have auto redirection to splash page on andriod and Iphone like the voucher authentication. It look like connectivitycheck.android.com and clients3.google.com were whitelisted by default so the splash page is not popping up but page appears when we manually open a browser and type bbc.com or yahoo.com.

If we have an option to edit or disable the whitelist added to the AP would be helpful.