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For hosting common files it's ok. Also it is on Android too do, great to transfer files between your Windows and your phone. But if you want better security you have to subscribe a monthly offer.
SIM Contacts Manager - SIM Contacts Manager app offers features that let you insert your sim card to your mobile phone to manage, edit, add, and delete your contacts right at your fingertips.
Dropbox - Online Sync and File Sharing
Save contacts - Save contacts app provides features through which users can select the desired data to create the backup in a variety of different formats.
Google Drive - Access and sync your files anywhere
X-Transfer - X-Transfer is an app by WebToGo that comes up with features to help you in performing data transfer between your smart devices in a few simple steps.
Mega - Secure File Storage and collaboration