Over the last month, the OnePlus One smartphone has received a large number of early supporters, all of whom are lining up to purchase the elusive handset.

The handset's 64GB variant happens to be in such great demand that the company has decided to manufacture it before churning out the 16GB unit in white.

According to PhoneArena, invites for the 64GB variant are being sent out to certain older forum members. The invite dispatch is being done on a first-come-first-served basis. This means that people with older forum accounts will be first in line.

Also, users will have to have a minimum amount of posts, with OnePlus One saying that the number of required posts is "less than you think". While the number could be as low as one or two posts, there's a chance that it could be much higher. The company also requires users to have made some recent posts.

For the fortunate few who do get an invite, OnePlus One has made it mandatory that they use it within 24 hours. If not they lose the opportunity for the time being. This makes sense as people might try selling their invites to make a quick buck.

Recently, we compared the specs of the OnePlus One with several Android smartphones including the Samsung Galaxy S5, Sony Xperia Z2, HTC One M8 and the iPhone 5S.

The company has said that it has been able to offer phones at extremely low rates because the handsets are being sold at cost.