In some Hotspots, the access voucher is locked permanently to the first device that logs on until the voucher's expiry. If the access voucher has been used, then it may not be possible for Ezhotspot to re-use that voucher. You can work around this by finding out the MAC address of that device and generate/clone the same MAC address while repeating to the Hotspot.
For iPhone & iPad devices
To locate the MAC address of your iPhone or iPad devices, start at the home menu. Select Settings -> General -> About. Scroll down that screen and you'll see a setting called “Wi-Fi Address”, that is your iPhone MAC address. Now enter that exact address as an allowed MAC address on your wireless network.
For Android based devices
To locate the MAC Address of your Android phone or Android tablet, follow these steps: On the Home screen, tap the Menu key and go to Settings. Scroll down and tap About Tablet then tap Status and then scroll down to view WiFi Mac address.
For Mac devices
To locate the MAC address of Mac devices, from the Apple menu, select System Preferences.... In System Preferences, from the View menu, select Network. In the left of the "Network" window that opens, click the name of your connection (e.g., Wi-Fi, AirPort, Ethernet, Built-in Ethernet)
For Windows (7/8/10) devices
Go to the Desktop.
Open a Windows Explorer window by clicking on the Windows Explorer icon on the taskbar.
Click on the small Folder icon in the Address bar, type cmd and then press Enter. New Command Prompt window will be opened.
In the Command Prompt window type getmac /v /fo list
Find the section that describes the adapter you want to find MAC address of. The Physical Address line shows MAC address as six groups of two hexadecimal digits, separated by hyphens (-).
Search for "Network" and under Settings.
Click on "View networking connections".
Then right-click on the Wi-Fi connection and select Status.
The MAC address appears in the dialog for "Physical Address".
Run: ipconfig /all from a command prompt (follow step 1 -3 in Method(1) ) and look for the appropriate adapter section.
For Linux based devices
Open a terminal window
Type "ifconfig -a"
From the displayed information, find eth0 (this is the default first Ethernet adapter)
Locate the number next to the HWaddr. This is your MAC address