Activation bypass on ios 7.1.2 iphone 4 & no service fix
Hello guys, i bought an iphone 4 from an unknown person 3 days back.when i received the phone it was working awesome but when i restored it using itunes it prompt me to enter the icloud login from someother account.when i contacted the buyer he is unavailable as his phone is off ( i dont think he is thief because i went to his office & bought this phone) . after that i saw many videos on youtube which told me to delete ([redacted] using java.i did it but now im strucked in no service problem.when i tried jailbreaking it , i wasnt able to do so because it told me to activate iphone. So could you please help me how to fix the no service problem or you can help me how to install cydia on this iphone so that i can use SAM to activate my sim.
Thanking you,hope i get good answers soon