Can't make international calls on iPhone 4s.

In settings/phone turn on dial assist. That will help you with the international dial out prefix to dial overseas numbere. Then if you wanted to ring me you would dial +61 7 XXXX XXXX with the + giving you the international dial out prefix for dial out of your country, 61 is my country code, my area code is 07 but the leading zero is ignored and XXXX XXXX is my landline. If you wanted to ring my cell phone you would dial +61 xxx xxxxxx My cell number is 0xxx xxxxxxx, the leading zero is dropped if calling from another country

What country you in and what country are you trying to call?

And of course what ckuan says is correct, your plan needs to allow OS dialling. I enter all my local number in my contacts in a consistent international format that works even if I am dialling a local number.

As an alternative while you sort out the SMS issue, does the remote party have an iPhone? If yes, you could try sending iMessages instead. Since they go via TCP/IP and thru Apple's servers, if both phones have data plans there may be a better chance of success. Plus you can send them between iPhones, iPads, iPods Touch and Macs.

Either set dial assist in settings/phone to on and then dial + 27 (area code without leading zero) (phone number without leading zero)

Or

0011 27 (area code without leading zero) (phone number without leading zero)

If that doesn't work then I would contact your carrier to make sure your plan does indeed support making international calls

International texting requires a text plan

Do you have the correct country code prefix number for International calls?

Here are the IDD codes http://www.idd.com.au/international-dialling-codes.php

And here are the country codes http://www.countrycallingcodes.com/countrylist.php

Heh, so Ocean20 may even be right next door and be your hero.

Worst case, can get together and throw a shrimp on the barbie.... 😝😉

Funny mate

Maybe bring your iPhone to an Apple Store nearwst to you and see what the genius says.

"what the genius says."

aaahhhhhhahahah

ROTFL!!