Wirelessly posted (BlackBerry8800/4.2.1 Profile/MIDP-2.0 Configuration/CLDC-1.1 VendorID/100)
Once you leave a carrier you void the warranty! It is in the terms of service I believe had same thing happen the other day. Customer came in to replace battery for phone they got 2 months ago but they had since cancelled not able to process warranty. All receipts gone from system.