i feel like also got problem le...
during phone call, cant even get to hear clearly haiss

so that on the spot, if leave already i think chance is low

like one of the forumer say... check it detail until like a sohchai....

Mine also have. I think is simcard or vibration motor

and i just realize my phone got scuff mark,tiny one ..

yeah,i just dont care about that scuff
can hide when using case

Dont be so OCD la.. if its the black one, sooner or later its going to get scuffed.. Just color it with black marker pen if so heart pain.. hahahah.. 

---

Added on December 15, 2012, 8:23 pm
My screen is yellow too.. my 2year old iphone 4 screen is so much better looking..

Y do u even need to shake the phone for??? hahaha..
Ok I'll do it just 4 u..
nope, no sound.. 

Im using OEM lightning cable . very tight , the problem is my cable can use oni one side . if im turn the connector to other side it cant charge

i hv the same issues but different story. after i lost my data signal, the 3g/E/GPRS just disappear and cannot auto detect. So i need to switch on/off, the 3g normal again... i found in the net, it can be solve by restore ur phone... but still lazy to do it... 

for your problem no.1

what i do usually is i do a network settings reset under the network setting ..

then usually it will revert to 3g/edge after awhile ..

for me this solution work ..

Depends on telco. But it usually wont. Its not like Astro la.