Anyone with an unlocked and eSIM compatible phone can join REALLY!
Carrier Unlocked Phone:
Unlocked phones are phones that aren’t tied to a specific carrier’s network. That means an unlocked phone can work with more than just one service provider. On the other hand, if your phone is locked, it usually means it’s not paid off or you’re still under contract with your current carrier; In some cases, a phone might be locked due to the Reseller Flex policy, which allows retailers to sell phones that are initially unlocked, but are programmed to lock to the first network they connect to at activation. You can call your current provider to check if your phone is unlocked or locked; if it’s locked, they should be able to help you unlock it.
eSIM Compatible Phone:
To make sure your phone actually supports eSIM. Most modern iPhone (from XS on) and Android devices are eSIM capable, but it is always recommended to check first. You can check here for a list of Android devices that are compatible with eSIMS.
5G Compatible Phone:
REALLY works on the nation's largest and fastest 5G network. This means you need a 5G-capable phone to access the network. 5G coverage varies nationwide and may or may not be available in your area.