I checked the logs on the wiki and none of them consulted red sandstone and they remain missing on both survival and creative as of the latest release version for iOS. Red sandstone adds on to the building element by making it more of a vast collection of blocks to choose from
Redsandstone
Red sand stone
Please do not assume the differences between any versions of Minecraft are bugs. If you wish to request new features or tweaks for Minecraft: Pocket Edition, please use the Suggestions Forum or Subreddit.
Also, do not add unreleased versions as affected.