CALLTO File Type
- The quick factsWhat are CALLTO files and how to open them
Are you having problems opening a CALLTO file or just wondering what they contain? We explain what these files are used for and show you software that we know can open or otherwise handle your files.
What is a CALLTO file?
The CALLTO file extension indicates to your device which app can open the file. However, different programs may use the CALLTO file type for different types of data.
While we do not yet describe the CALLTO file format and its common uses, we do know which programs are known to open these files, as we receive dozens of suggestions from users like yourself every day about specific file types and which programs they use to open them.
We are continually working on adding more file type descriptions to the site, so if you have information about CALLTO files that you think will help others, please use the Update Info link below to submit it to us - we'd love to hear from you!
How to open CALLTO files
Important: Different programs may use files with the CALLTO file extension for different purposes, so unless you are sure which format your CALLTO file is, you may need to try a few different programs.
While we have not verified the apps ourselves yet, our users have suggested 5 different CALLTO openers which you will find listed below.
Various apps that use files with this extension
These apps are known to open certain types of CALLTO files. Remember, different programs may use CALLTO files for different purposes, so you may need to try out a few of them to be able to open your specific file.
 | Ringomax | User submitted |
| PTT JAPAN | User submitted |
| PTTJapanPlus | User submitted |
| UcallWeconn | User submitted |
| GlobalTalk | User submitted |
Try a universal file viewer
Try a universal file viewer like Free File Viewer. It can open over 200 different types of files - and most likely yours too. Download Free File Viewer here.
Not sure exactly what type of file you are trying to open? Try our new File Analyzer. It is a free tool that can identify more than 11,000 different kinds of files - most likely yours too! It will help you find software that can handle your specific type of file. Download File Analyzer here.