Hi @Kasun with 5G it runs on high frequency which means the signal can`t travel long distance as such it covers small area compared to 4G which runs on a bit lower frequency and has more coverage area. Also with 5G the device (modem) has to be in direct line with the tower else the connection won`t work. This could be the reason your particular address is not serviceable. However you can register your interest → here and when it is available we will notify you.
Appreciate where you are coming from @Kasun however we can`t sell 5G products to customers just because they have 4G coverage to fall back to. When sales team check the serviceability of an add and if it is not serviceable with 5G then we can`t sell that product. That would be for e.g. selling a lower end product by promising a higher end product even when we know customer can`t get higher end product. This is the very reason we also offer 4G Home wireless broadband to customers. Please visit our → 4G Home wireless broadband page for more info.