i brought a se k550i from this guy last sunday at commonwealth with a guarantee that the unit was not opened and no issues or defects were included other than a hairline in the camera,and a dead pixel when taking pictures, so the transaction was smooh and fast and after 24 hrs when i inserted my globe sim, the phone didnt recognize it and came up as inactive sim, i tried to insert other sims and after 24hrs as well, it came up also as inactive, ergo, this product was either blocked by the the previous network fr a former subscriber for unpaid bills during its postpaid subscription or it was a STOLEN phone,coz why then would it invalidate all networks inserted if it were not so, then that would mean that it was a postpaid phone fr all networks which is highly unlikely since the former user wouldnt easily switch fr one network to another. i thought this portal was impenetrable fr having sellers like him regardless of his lack of knowledge that he insists he used the phone for 1 yr under smart, i inserted my talk and text sim(also a smart subsidiary) to replace my globe and it also unrecognized that.