The device itself is quite good but it is incomprehensible why it has received only 8 GB, non-expandable, memory factory. That's enough for photos, offline navigation and MP3 songs just are not enough. The Single-Sim version for 20 euros more has a SD card slot, NFC, a stronger battery and even LTE. The dual SIM user must make friends with this unit, which is extremely limited in its efficiency by only 8GB of internal memory. Poor product policy Alcatel China.