android gmail does not highlight phone numbers

I have a samsung galaxy s4 duos phone. Gmail does not highlight phone numbers in message subjects (something that enables you to click on it and call). My friend has that feature on his windows phone. Do you know how to fix it?
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Brandon LyonSenior Frontend DeveloperCommented:
I have a phone on Android 4.2 (Samsung Note 2) and my gmail highlights phone numbers in messages. Are you perhaps viewing something in the spam folder? It might not highlight if it thinks the email is phising you.
axcxAuthor Commented:
"Regular" folder for incoming e-mails. These are customers' forms from my website. I want to call them back.
Brandon LyonSenior Frontend DeveloperCommented:
How is the phone number formatted? Is it just numbers? Dashed? With parentheses?
There may be some HTML in the email which is causing that parser to stop working. Do you have a sample part of the email's markup we can use (without personal information)?

Alternately, since it sounds like you're in charge of the form on your website, you can add the following markup to the emails in order to help your phone recognize that its a phone number:

<a href=”tel:123-456-7890“>1234567890</a>

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axcxAuthor Commented:
Just a 9-digit number. My webmaster sent emails to his windows phone and had no problems with it. So probably this is not about email format.
Brandon LyonSenior Frontend DeveloperCommented:
Something is wrong. There is no reason why gmail on Android wouldn't make a phone number in an email clickable. That is the default behavior since as far back as I can remember.

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