RuneScape is free to RuneScape Gold play. However, subscribers get access to more adventures, skills, and benefits. You can check out the subscription for free during a seven days of trial. The mobile versions support cross-play and cross-progression with PC which means you can switch between the two platforms and then continue from where you left off.
Note that this will not be Old School RuneScape, a version based on a build that was released in 2007. It's available both iOS and Android since the year 2018. This is the fully-fledged RuneScape that Jagex has been constantly updating for the last 20 years.
There's a clear appetite for RuneScape available on iOS in addition to Android. There are more than 1.8 million players have registered to play the games that have an intuitive user interface that's mobile-friendly with improved menus, icons and menus text and textures. Combat mechanics were also improved to work on iOS in addition to Android.
The company has filed two trademarks in the UK One trademark is to "OSRS Gold" and another for "RS Gold" and noting that it has registered trademarks that use the phrases as words. This will likely stop third-party websites from being allowed to market their products as Buy OSRS Gold RS Gold.