Sky Gigafast SR203 and Asus ZenWifi mini TX4 help

[Iamphilthebear]

Hi,

Ive been on BT FTTP (removed the BT Home Hub) for 2 years and switched to Sky FTTP as BT tried upping their price to £98 per month.  Anyhoo, Can anyone advise how I set up the Asus ZenWifi TX4 to act as router with AI Mesh.  I have it currently working through the SR203, but the wifi is behaving odd so would like to have the same setup as I did with BT i.e. FTTP and direct to Asus router.

I read numerous posts on here relating to the TX6/8 but I ge tlost with all the info shared, so an idiots guide would be perfect if possible 🙂 

Thanks!

[Iamphilthebear]

Note: When I say behaving odd, I mean laptop wifi is stable, but accessing wifi with mobile phones is nonexistent?! 

[Iamphilthebear]

**Update**

Managed to connect everything but the slow wifi speed/no connection via iPhone still persists?  Wifi via laptop etc is perfectly fine though??