Anyone change their battery to third party battery for more juice?

Not yet, though BL-4J 1850mAh is on my mind.

battery drain quite fast, two hours 40%

Try remove battery and return phone?

still the same after remove battery

ok fixed, i remove micro sd card, run cmd and enter chkdsk /f and its now fixed, not sure wats wrong with it.

probably the partition got problem, wp8 filing system is a bit tedious, you can't rename anything in the phone once you copied it inside, you have to rename it first in pc before moving.

Is there an app where I can monitor data usage?

try turn off the phone and switch on with the cable intact.
then it will start to install driver and recognize the phone

Anyone have prob with the vibration?

I test with hardware test, no feedback.
then when I bump the phone during test it vibrate.
after that can keep vibrate, but when I stop test then it won't vibrate..

Have you try remove battery and restart the phone?

same here.. but only when the phone is in my pocket..

Me too, facing the same problem, especially when it's in my pocket. can't do anything but to let it ring.....
The screen just hang, won't respond to any touch but the buttons do work though.

have u ever try lock the screen n unlock it back?

yes, everytime the screen freeze, just do a quick lock and unlock, then it will be fine again. suspected firmware bug

yeah

always happen to me

lock it n unlock it backk

can answer the call

just need to be quick

Thanks for the tip guys will try that when it freezes again.

How do you set Umobile APN settings on your 620 ?

Settings -> access point -> add

I did that

Create 'U Mobile Internet' and set APN as 'my3g'

still can't access data, although there is a H icon next to the signal bar