Can one OCR an image PDF (for instance the bill from Telcel my phone carrier) can I OCR an image PDF with the NVDA's OCR AddOn? Thanks for info.

If you have to do this a page at a time using NVDA's OCR facility then it
would be much easier to use Tracker Software's PDF-XChange Viewer (
https://www.tracker-software.com/product/downloads/discontinued ) software
to do it.  Once you've downloaded and installed it these are the
step-by-step instructions for performing OCR on the file (in English by
default, other languages are available, and also free):

*Dealing with PDF Files*

If you receive an image PDF file, here’s how you can do optical character
recognition (OCR) processing on it to get the text that JAWS or ZoomText can
read:

1.    Open the file using PDF eXchange Viewer.   PDF eXchange Viewer has the
same Open and Save commands under the File Menu that you’re used to in
MS-Word.  Use ALT+F, O to open a file, and ALT+F, S to save it.

2.    Once the file has been opened, hit CTRL+SHIFT+C to perform the OCR
process.  Once you do this a dialog will pop up that requires no input from
you other than hitting the OK key (which you can do by hitting ENTER, since
OK is the default response).

3.    A progress box will now appear showing the processing for the OCR.  If
the file is short, say under 10 pages, this will usually be done in a matter
of seconds.   If it’s large it will take longer.  If you’re using ZoomText
at the time slide over until you see the Cancel  button and there will be a
percentage indicator above it.  When the OCR finishes the progress box will
automatically close.

4.    Make sure to save the document so that the OCR text remains with it
permanently.

5.    You’re finished.

--
Brian  - Windows 10 Home, 64-Bit, Version 1703, Build 15063  (dot level on
request - it changes too often to keep in signature)

*     * *The opposite of a correct statement is a false statement.* *  But
the opposite of a profound truth may well be another* * profound truth.*

*           ~ * *Niels Bohr*