<a href="tel:" not="" working=""

Question

="" i am trying to dial a phone call on link, for that i used "tel" tag, its giving error that protocol not supported, i used following in HTML.

<a href='tel:9761111769'>+91 9761111769</a> not working.

i have used required meta tag

<meta name="format-detection" content="telephone=no" />

also have added following permissions in manifest.xml file.

<uses-permission android:name="android.permission.READ_PHONE_STATE" />
<uses-permission android:name="android.permission.CALL_PHONE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/> 

and following code in config.xml

<access origin="*"/>
<access origin="tel:*" launch-external="true"/>

i trying to changes in syntax and implementing some solutions from web but its not working.... please tell me what thing i have to check in my code or any changes in existing code..Thanks