When i try to make a call it says network busy every time. Also it do not received any incoming calls.what s the reason?

Disconnect all the phones. Then plug in one simple phone to the main incoming phone jack. This is normally a larger box and near the front door or incoming power distribution board. If that works, you have a faulty phone somewhere in the house. If that phone fails, your telco cut you off or there is a line fault.

This could be a telco problem. Contact Samsung and your carrier to inquire.

phone b.t maybe fault on the line

tried to remove the sim card and then re attached. or might the network provider was busy or have problem at this time.

If you do not pay your bill, you will not get incoming calls or messages and you cannot call or send messages. Your phone will not work if you do ot pay for it.
According to the article, and other information I've been reading, there is more than one possible mode a GPRS/EDGE phone network can be configured to operate in, 001 and 002 being the most common. In mode 001 if an incoming call occurs during data use the data session will be terminated and the call will come through. In mode 002, the call will go straight to voicemail. Apparently the majority of 2G networks in the world use mode 002!

It's possible to use the iPhone's field test mode to see what Network Operating Mode is for the network - to do this, first disable 3G, then go into field test mode by dialing *3001#12345#* from the phone app keypad then pressing call, then go to GSM Cell Environment -> GPRS Information, and scroll down to "Network Operating Mode".

I've checked this for all 5 networks and in all cases (at least where I live) it was mode 002 - the mode which doesn't allow for incoming calls when 2G data is in use.

The ramifications of all this are that any time you use data on GPRS/EDGE you will miss incoming calls and unless you have a missed call service with your provider, you won't even know you missed them, as they will not show up on the phone. (And the missed call texts themselves will be delayed as well)

Not only can this be caused by actively using an app such as safari, (or leaving a data using app active with the screen locked) but background mail checks and push notifications will cause it as well. So if your phone is lying there unattended and it happens to do it's 30 minute (or whatever) mail check just before someone tries to call you - missed call.

Having push notifications enabled is even worse, because it tries to keep an active data session as much as possible, and re-establishes this connection every time the data connection is interrupted.

One good example of this is if you have push notifications active, try making or receiving a call, hang up, and call the phone back in less than 30 seconds or so of the previous call - missed call.

The reason is that the GPRS/EDGE connection was interrupted by the first call, so when the call ended the phone immediately tries to re-establish the push data connection, and on a slow connection this takes up to a minute to do and then go idle before the phone can receive another incoming call.

I'm stunned that a problem of this magnitude (which is not really the phones fault at all, but is made far worse by turning on push notifications and background email checking) has been seemingly covered up and glossed over for so long - the O2 UK forum has a message thread with over 500 people complaining of frequent missed calls, with no official acknowledgement from O2 on what the cause is, with the only suggestion being to turn off push notifications. (Which will ease the problem but won't cure it)

What baffles me is why the networks don't just run in mode 001, which allows incoming calls to interrupt the data session - surely an incoming call is more important than finishing downloading an email ? Surely with more and more phones relying on data and trying to hold persistent push connections open, this is only going to become more and more of an issue ?

Perhaps someone like Planner could comment on why networks might not be using mode 001, I'm assuming it either has some drawbacks or compatibility problems with some phones, or is an added cost to support. Is there any likelyhood of this ever changing ?

Now it makes sense why if you're using a network where you tend to get 3G most of the time (such as I do with Orange or 3) then the problem is minor because you're not on 2G very often, but if you're on a network where you will be using GPRS/EDGE a lot (cough, O2) then you really can't afford to leave push notifications enabled, unless you like missed calls...

there are several factors why you are unable to send and receive messages and make outgoing calls and receive incoming calls.
network issue: are you the only one experiencing the problem? try to check with someone who is on the same location and is using the same network as you if he or she is experiencing the same problem as you. if yes, then it may be a problem with your network.
make sure that you have good signal and contact your service provider too and ask them if they have an ongoing maintenance in the area and ask if the sms and calls services are activated on your account
phone issue: if you have a good signal and still can't send, receive text messages, do and receive incoming, outgoing calls, try to do these: call the service provider and ask for the default network pin, then go to the settings of your phone, call settings, call barring, deactivate all barring
try inserting your sim card to another phone and try to send an sms
turn off your phone, remove battery and sim card and then wait for a few seconds, then put back the sim and battery and turn on the phone then try to send an sms

it maybe your PA IC is damaged... my need to check it to a cellphone technician

HI,
Nokia 6111 and Nokia 6300 are the ultimate phones and I like it very much.
SOLUTION:
1.Go to "menu". 2.Then select "settings" by scrolling down. 3.Inside "settings" menu, go to "call settings". 4.Inside call settings we can see various options to select that contains reject/show busy/divert.we can choose any one from them.
SOME TRICKS: Hiding your Mobile/ Cellphone Number
1.Go to: Menu > Tools > Settings > Call > Send My Caller ID >
"'Yes', 'No' or 'Set By Network'" to follow the default settings of your home network.
It works only with very few network who provide you facility of “Private Number”

some times cos of the area u might have to stuff with the settings in the network settings section.

Use the network services menu for this...

Use this menu to access network services. Please
contact your service provider to check their availability and subscribe to them, if you wish.

This network service allows you to restrict your calls.
1. Select a call barring option:
• All outgoing: prohibit outgoing calls.
• International: prohibit international calls.
• International except home: only allow calls
to numbers within the current country when
you are abroad, and to your home country.
• All incoming: prohibit incoming calls.
• Incoming while abroad: prohibit incoming
calls when you use your phone outside of your
home country.
• Cancel all: cancel all call barring settings,
allowing to be sent and received normally.
• Change barring password: change the call
barring password obtained from your service
provider.
2. Select the type of calls to be barred.
This network service allows you to restrict your calls.
1. Select a call barring option:
• All outgoing: prohibit outgoing calls.
• International: prohibit international calls.
• International except home: only allow calls
to numbers within the current country when
you are abroad, and to your home country.
• All incoming: prohibit incoming calls.
• Incoming while abroad: prohibit incoming
calls when you use your phone outside of your
home country.
• Cancel all: cancel all call barring settings,
allowing to be sent and received normally.
• Change barring password: change the call
barring password obtained from your service
provider.
2. Select the type of calls to be barred.

if you have any queries about your mobile..you can have a look at this user manual which can be downloaded from

http://safemanuals.com/user-guide-instructions-owner-manual/SAMSUNG/SGH-D600-_E

hope this helps :)