I know the trick buddy but same is not applicable on XStream Box....neither there is any free preview nor u can add or drop 10 days free top up....also being a responsible customer i don't like trying such things/tricks rather i feel happy to pay for whatever service i like watching if it is under pay wall or opt for offers
/freebies which r officially made available..... Generally too i never like opting for such tactics in real life be it in anything, if a person or company is providing u service then it is our duty to pay them amount/money applicable for that rather than finding loopholes or yp avoid paying the same