iOS users are going to have to wait.
This week’s RuneScape update has rendered the game unplayable for a number of mobile users. On the official website today Jagex announced that an update has been deployed that resolves log-in issues on both platforms. Android users should be able to log in as of this publishing.
Unfortunately iOS users will need to wait until the update actually becomes available which might take a day or so.
“Unfortunately, due to the way the RuneScape iOS Closed Beta operates, this fix may take up to 24 hours to take effect on Apple platforms. Once the update for iOS becomes available, you’ll need to grab the latest version from the TestFlight app. If you have notifications enabled, you’ll receive one as soon as it arrives.”
For more information check out the official website.
Source: Jagex