Which country telphone number start with 86 area code

Where are you dialing from/ what country are you in.
All countries have this sequence of numbers to call another country;
IDD COUNTRY CODE CITY CODE PHONE NUMBER Dialing Instructions

1. Dial the International Direct Dialing (IDD) number. Countries have different numbers, or may have more than one IDD, depending on the carrier or type of service.
2. Dial the Country Code. In some cases, the country code is shared among countries. For example, the United States, Canada, and much of the Caribbean and Guam use country code 1
3. Dial the city/area code (if any) for the number you are dialing. Smaller countries may not use city codes or area codes, while larger countries have hundreds of them.
4. Dial the phone number you are calling.

How To Dial Internationally

Country code are only needed when you are calling another country from the U.S. If you are calling withing the United States all you need is an area code and the phone number.
Area codes for Louisiana are:
Alexandria area code 318; Baton Rouge area code 225; Bossier City area code 318 ...Houma area code 985; Kenner area code 504; Lafayette area code 337 ...

You can try the manufacturer:
Company: Ocean Electrical Appliances Co., Ltd
Address: Mashe Industrial Area , Guihe Road, Lishui Town, Nanhai
City: Foshan
Country: China
State/Province: Guangdong
Zip/Postal Code: 528200
Phone Number: (86 757) 81853704 (86 757) 81853706
Fax Number: (86 757) 81853702
Homepage Address:http://www.globalsources.com/oceangd.co

But for more immediate response, try a local appliance dealer that handles that product.
Other than that, try the secondary market or used appliance dealers, they occasionally "part out" appliances.

In the phone application, press the Menu key.
Click Options.
Click Smart Dialing.
Set the Country Code and Area Code fields.
If necessary, set the Local Country Code and International Dialing Digits fields.
In the National Number Length field, set the default length for phone numbers in your country.
Press the Menu key.
Click Save.

you may visit some mobile sites.....

country code and area depends on your present location. Location data include your current city,and country.
phone codes may vary also on network carriers,
example
I am in philippines, (63) (49) (1234567)
(63) country code (49) area code (1234567) phone number
In mobile phones
I am in Philippines, (63) (919) (1234567)
(63) country code (919) local network carrier (1234567) SIM number

Since you neglected to specify the model of your Uniden DECT 6.0 system I can only suggest you select it from the list beginning here to download a copy of the manual.

Calls outside your area code need the area code. Some parts of the country use ten-digit phone numbers for local calls, in these cases the area code is needed. Other parts of the country use seven-digit phone numbers for local calls, in these cases the area code is not needed unless you're calling outside your area.

It is within the phone options.

When you do your automatic dialing, does the number include the area code? ie. mine is 937 (937-xxx-xxxx)
If you don't have the area code put in with the rest of the number, that may be your problem. 1 is the country code for USA, so normally when you see a number that says +11234567890, its country code, area code, phone number.
+1(country)123(area code)4567890(phone number)
So anyway, the only thing I can think of is to put the area code in the phone numbers in your address book if they are not already there. Other than that, I dont know.