Attracted by the price, but very worried by the comments left, I decided to buy anyway. Being delivered via AMAZON, I could make a safe return to any problems.
Packaging OK, complete accessory. I insert my sim card. I turn on such and puts it in charge.
Dutch Configuration => I change the language: French, ditto for the Qwerty keyboard Azerti,
I end configuration, updates via WIFI, including Android (be patient) I = all parameter> Balance OK.
I call a little more than 5 minutes as recommended on the box for the rezone (it's a dedicated S5 Europe).
I turn it off completely, the on again: still no 4G displayed (I have a sim card Free)
I insert a sim card from a friend Orange: 4G icon was displayed 2 seconds. Encouraging.
My Account Free mobile: 4G is enabled, and area covered by 4G Free. I reinserted my SIM card, but still no 4G.
Solution that has walked for me: I manually forced registration on the network:
Menu setting / party connection Network / icon over network / mobile network (mobile data is checked), then click on the network operator.
I left turn research and clicked Free. I had the registration message on the network and 4G was displayed.
To boost the Download (Download in WiFi and 4G at the same time): still under the Network Connection menu / select Download icon booster and enable all. The video download in HD (Utube) are downloaded at an impressive speed !!
In any case for me, I do not regret this purchase. Satisfied: beautiful screen, fluid, fast, the code via fingerprint works well (do not hesitate to redo your fingerprints, must be used to at first, but then it works well), cardiac sensor behind works well too. the picture quality is amazing and fast setting (compared to my old Galaxy S2).
Hoping that my experience will be useful, sorry if I was long, and hoping to help you in your choice ...
