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There are plenty of fax apps for mobile platphorms, i.e. for Android.
For example Popcompanion for Android
The app is available on Marketplace for free, and there is a free trial.
Although if you need to send faxes from Android regularly or receive faxes to your personal fax number, of course this cannot be for free, because any good service is payable.
Sfax have launched an app for Android
The mobile app is completely secure and HIPAA, GLBA and SOX compliant – adhering to the privacy rules for exchanging protected information.
I hope this helps