Can I put my SIM card in a phone with a bad ESN?

[jUiCe]

I was looking at a phone on ebay (because my old phone broke) but it has a bad ESN. Can I put my old sim in it with no problems?

[geeth]

HI yes you can use your old sim in the phone only if it is unlocked .Else if the phone is locked then until you unlock it you can't freely use it with any other GSM sim .You can easily unlock the phone using sites like SuperUnlockCodes.com here they are providing unlock code for all mobile models at reliable cost..