The offer is available for two years after the sign-up, delivering double the storage that HTC users have been offered. Back in February, the Taiwanese-based manufacturer signed a deal with Dropbox which gave users access to an extra 25GB of free storage, also for two years.
Dropbox has yet to announce what will happen after the two years of service comes to an end, and how much it will cost Galaxy S3 owners to renew the deal.
The bonus comes as a blessing for those looking to purchase the 16GB variant of the Samsung Galaxy S3 along with its steady data connection. Gamers will also appreciate it, due to the fact that Samsung's new flagship product is ideal for high quality games that tend to eat up a substantial amount of storage.
The S3 comes with a large 4.8in Super AMOLED display, an 8MP camera and a 1.4GHz quad-core CPU from Exynos.
The Galaxy S III was unveiled yesterday in London and will be released on the market at the end of the month, while the 4G variant will be pushed this summer in other markets. Unfortunately, there's very little chance of seeing the LTE flavour arrive in the UK any time soon.