DIEZEONE is free and offers you:
+ A directory of USSD codes (# 123 #, # 176 #, etc.) of Senegalese telephone operators
+ A directory of useful numbers (emergencies, pharmacies, restaurants, hotels, etc.).
+ Functionality of backup and restore your contacts.
+ Functionality of backup and restore of your SMS / MMS
+ Functionality of backup and restoration of your calendar of events