Microsoft Office Goes Fully Free on iPhone and Android Phones

https://itunes.apple.com/us/app/office-mobile-for-office-365/id541164041?mt=8

https://play.google.com/store/apps/details?id=com.microsoft.office.officehub

Some other

https://play.google.com/store/apps/details?id=cn.wps.moffice_eng

https://play.google.com/store/apps/details?id=com.quickoffice.android

https://play.google.com/store/apps/details?id=com.mobisystems.office