https://www.cnet.com/news/samsung-galaxy-s9-s9-plus-128gb-and-256gb-storage-options-arrive-in-may/

Samsung is bumping up the storage options on its Galaxy S9 phones just in time for summer vacations and events. 

The S9 and S9 Plus announced back in March, but it only made 64GB versions available to carriers. You'll now be able to pick up both models with 128GB or 256GB of built-in storage. You can then add up to 400GB of additional storage with an optional microSD card.