How to remove the password on samsung i9300 china phone

From the Official Samsung website,
this is the Samsung Galaxy s3 PDF manual in English (for FREE, at no cost):

GT i9300 International Version
http://downloadcenter.samsung.com/content/UM/201302/20130228184012484/GT-I9300_UM_EU_Jellybean_Eng_Rev.1.1_130228_Screen.pdf

AT&T Version:
https://www.att.com/support_static_files/manuals/Samsung_Galaxy_S_III.pdf

Sprint Version:
http://support.sprint.com/global/pdf/user_guides/samsung/galaxy_s/samsung_galaxy_s_ug.pdf

T Mobile Version:
https://support.t-mobile.com/servlet/JiveServlet/previewBody/6302-102-2-21849/Samsung%20Galaxy%20S%20III%20User%20Manual.pdf

Verizon Version:
http://downloadcenter.samsung.com/content/UM/201207/20120706131108550/VZW_SCH-i535_English_User_Manual_LG1_F5.pdf

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Hi.
The only way to rest ypur voice.ail password is to contact your service providers help line. After they verify your account they will do the reset to default.

go to settings => lock screen => click on the 'shortcuts' or lock screen widget shortcut (forgot the name). There you can change or remove it

hard reset the device, google it.

Which email service? Is there a "Forgot your password?" or "Can't access your account?" or some similar link on the sign-in page?

what is the internet settings of China Iphone Model G2000

You mean you want to unlock the phone from a particular locked network?I suggest you can approach Theunlockspot.com and remove the network lock easily and permanently.You need to specify the country,locked network and based on the availability get the unlock service for your Samsung Galaxy S3 i9300.

check and adjust the area for the unit. It may still be set for china and not for your country.

Download OPERA MINI from other phone and simply copy and paste it in your phone..

china samsung i9500 phone reset password