you should go for Maxis or Celcom,

Celcom may have widest coverage, but Maxis may have the best speed in rural areas

overcharge billing ? how ??  I thought maxis is more popular for that ?

so far, i never get the overcharge billing for my maxis postpaid plan..

let say you subscribed for 3GB data quota, you just need make sure that, you don't exceed the 3GB quota.. it is simple just like that, maxis will send you sms on 100MB before exceed the quota..

You can change from Postpaid to Prepaid by using the same number

yes , telco can do it , they can change from postpaid to prepaid if they want 

no, telco also have postpaid that includes 3G data, usualy the iphone plan (maxis ivalue, idigi, celcom i-plan). maxis also have vpi 80 (500mb + 300mins + 300sms).

if u really want 3gb + supp line, can go for idigi138 (rm93/month). free 450mins + 400sms.
add supp line rm15 (family prepaid) total will be rm108 only (exclude tax).

but this plan must buy iphone (cannot buy other smartphone), and contract is 24months ~

darkdevilrey, maxis user here (also celcom, digi & tunetalk. yes i have 4 mobile telcos. no need to know y).

ok u said that u 1st time using maxis postpaid.
then, u should know, maxis normal postpaid (not biz) plan, once u reach the quota, u will be charged.
stated there, not hidden. as simple as that ~ fair enough, this is understandable.

For VPI plan (its just under the plan rate as u quote):
"You will receive an SMS notification once you've reached 100% of your monthly internet allocation. Choose to upgrade with these affordable passes or continue surfing at only 30 sen/MB."

so if u use VPI80, ur free data is only 500mb.
that plan is for user who only need less than 500mb/month.
ur phone might access the internet w/o ur knowledge, so probably exceed the quota. dint exceed. i used data app to monitor.

for ur use of VPI50 for 7days being charged RM35, pls see the monthly charges as 1st bill is pro-rated.
by default, VPI50 for 7days monthly charges is rm11.67*.
so the free amount also will be pro-rated; 23mins*,23sms* & 58mb*
(*assume the month have 30 days).
once u exceed all the free mins, sms, and data, u will be charged.
dats the reason why ur bill is rm35 ~

for exceeding the quota, maxis will shows the data size and the charged amount but will waived back.
if, usage on that month didnt exceed the quota, the data size wont shows at the bill.
i dont know why they do that, maybe for user to see how much the data they had exceeded.

u wonder why people still use maxis, but u already answer it.
yes, because of the coverage. same goes to any other telco, coverage is the most important reason.
maybe in ur place maxis coverage is not good MY PLACE IS KLCC PETRONAS TOWER NEXT TO MENARA MAXIS , but for other people, they have no coverage problem, and can get speed up to 42mbps to online ~!

next, ur statement of "unlike digi internet usage 150mb cost RM0.00" is only applicable, if, u sign up with dg 88 plus, smartplan, or idigi yes, exactly.

if u just signup for dg 48 plus, u will be charged even just using 10kb of data.
while dg 68 plus free 100mb only, u still will be charged for that extra 50mb

since u said maxis line is not good at ur place while digi is goodMY AREA IS KLCC, NEXT TO MENARA MAXIS , so just switched back to digi.
u should check the line/coverage 1st before u switch, didnt u?
e.g by using fren/relative phone with maxis at ur place.

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Added on August 17, 2012, 1:32 ambtw, for proxy server error, in ur smartphone setting, pls empty the proxy server number