Following my purchase of the iPhone4 from Maxis center. After using it for 3 days, I noticed a clicking sound whenever I shake the phone. Compared to my friends and colleagues unit, I noticed something loose inside. We tried to remove and put back the sim card but same problem.
Hence, I brought it to Maxis center. Prior to the warranty, I restored the phone to factory setting and found the phone unable to boot because I had already jailbroken it with limera1n. That is the shortcoming of it.
Then I took it over to the Maxis center and blame it on the loose part within. They agreed for a 1 to 1 exchange. It was the Friday before Christmas. They told me needed 10 days for Brightstar to send a replacement unit. Damn!! Replace one unit also take 10 days. The staff there tried to rush for it before Christmas but ask me not to put much hope.
Sure, on the Wed of Christmas week, they called and said the replacement unit is here. I got it, happy and no more sound. New IMEI number, new unit!

Yay!
Thumbs up for Maxis service!