My iphone 4 makes outgoing and receives incoming calls. However, when connection is made you are unable to here the other person and they can't hear you. Data applications, such as; Facetime are not affected.

SOURCE: IPhone - Can't hear incoming calls. Does not ring or Vibrate.

I had a similar problem....it was usually after I unplugged the headphones....the phone thought they were still attached, therefore, nothing came over the speaker......try plugging in the headphones, then unplugging...that worked for me.

SOURCE: I cannot make outgoing calls with my iphone.

I have ran into this same problem with 2.2 on and iPhone 3G, sadly you will need to plug your phone into your computer and do a restore of the system software, I would go to 2.2.1 when you restore.

SOURCE: cannot receive incoming calls on unlocked 3g ihpone

sync ur iphone with pc....it will work

SOURCE: incoming call problems

Could be that it's just a software hickup: press menu and on/off button togetherfor 5 sec. If it's the same after the restart you need a new earspeaker. You can also use a headset, if it works with the headset, you definitely need a new earspeaker.There is a step by step guide too that explains a little bit at eachsteps what you have to do : iPhone speaker repair. You can buy the touch screens online too. There are also iphone repair companies that do it for you.

SOURCE: iphone no incoming or outgoing calls possible

Make sure "airplane mode" is set to off

Check your sim card is properly inserted
You should be prompted for the sim pin number when the iphone loads up (if it has one set). If the pin number is not entered the sim card will not register with your provider.


If you open settings, what is next to "carrier" ?
it should state your provider there.
If it doesn't, tap it and see if it will list your carrier, by default the iphone is set to automatic, you may need to manually select your provider.

If none of this works, give a detailed description of what has been tried and any other details you can