Can you detect whether a device has phone capabilities (e.g. it can make voice calls/SMS) with JavaScript?

Question

Is there any way to detect whether a mobile device is capable of making voice calls / SMS messages?

This is important when applying tel: and sms:<

Answer 1

I havent seen an obvious way to see that sms: and tel: links get special treatment.

Update: @janogosteve below has confirmed there is currently no reliable feature detect. This looks undetectable.

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Here's a comprehensive way to check this feature detect. (Read jangosteve comment below!)

• make a test page with two of those links and a regular http link
• grab the elements and then traverse all their properties, copy it all over to an object..
• also getComputedStyle info for a bunch of details on them and throw that into an object as well
• JSON.stringify( that stuff so you can deal with it later on)

Do the above on an iOS device and in desktop Safari/Chrome

Then JSON.parse them back into objects... and use https://github.com/NV/objectDiff.js to see if you can spot any differences at all.