how do i upload a pic from my phone to a FB page?

[Duane]

I want to post pics on a page also on others comments, I see it al the time, don't know how

[Shirley]

There are basically three ways by which you can send photos from a mobile phone to the Facebook website – MMS, Mobile Phone Apps and Email. Let’s look at each of these options one by one.
Facebook Apps for Mobile

If you have a smartphone like the iPhone, BlackBerry, Windows Mobile or Nokia (with Ovi Store), you can visit m.facebook.com using the internet browser of your mobile phone and download the Facebook application for your device. These apps will often integrate with the camera function of your phone and provide an option to directly upload pictures to Facebook right after they’ve been taken.

Facebook MMS
Now if you are not carrying a smartphone but still want to move pictures from the phone to Facebook, you can use picture messaging or MMS. Here’s how it works.

Compose a new MMS message on your mobile phone and attach the image file that you want to post to your Facebook stream with the MSS message. Send that MMS to mobile@facebook.com (email, not phone) and Facebook will send you a confirmation code (via text) to associate your mobile phone number with your Facebook profile.

Facebook Email
Luckily, there’s another option provided your mobile phone can send email. Go to facebook.com/mobile and note a special “upload” email address that has been assigned to you by Facebook. Any photograph (or video clip) that is sent to this address via email will instantly get posted to your Facebook page.

[Kasey]

I downloaded Facebook Pages Manager and I use that

[UTKARSH]

Simply download fb page manager. You can even read page messages too.