Galaxy S2, unlocked and updated +

I am looking at swapping or selling my unlocked Samsung Galaxy S2. This phone is in excellent condition, boxed and also has screen guard fitted (comes with spares also), protective gel case and will also be supplied with larger more powerful battery. Comes with 2 backs to compensate for the batteries size. This battery really makes a difference as it holds a lot more life. Does come with original battery and back. The phone has been recently upgraded to android jellybean 4.1.1 and is amazing. 16GB micro SD card will be supplied with it if a phone that really takes my fancy is offered. 16GB internal storage also. Wanting to swap for another excellent phone. NO lower cash offers and NO Blackberries or Windows phone offers! Many thanks for looking.