Cannot connect to App Store iPhone 6 iOS 8.3

Hi,

I cannot connect to the App Store from the App Store app neither from the 'iTunes & App Store' setting.

Particularly, if I open the App Store app, scroll to the bottom of the page, Sign in: fill in my credential but nothing happens.

Same from the Settings: fill in my credential but nothing happens.

I can see from the App Store app that, apparently, there ano no network activity. From the Setting item I can see it. When I tap on Sign in, the button goes disable, the network activity spins, after few seconds, it ends, and the button goes Enable again.

I tried to:

* Hard reset device

* Set Date and Time automatically

* Clean Safari web cache and history

This is very annoying, I cannot login so I cannot update my apps neither BUY new apps.

For completion, is I do this task with the device connected to my Mac, in XCode device console I get the following:

May 15 17:30:37 iMulp6 wifid[37] <Notice>: WiFi:[453400237.621953]: Client itunesstored set type to background application

May 15 17:30:37 iMulp6 wifid[37] <Notice>: WiFi:[453400237.622176]: __WiFiManagerSetEnableState: state TRUE, manager->enable.setting TRUE, manager->unlockedSinceBoot TRUE

May 15 17:30:37 iMulp6 wifid[37] <Notice>: WiFi:[453400237.623772]: BG Application: Not Present, BG Daemon: Present. Daemons: itunesstored assistantd

May 15 17:30:37 iMulp6 wifid[37] <Notice>: WiFi:[453400237.626163]: Auto association attempt canceled because device is not powered.

May 15 17:30:37 iMulp6 itunescloudd[164] <Notice>: (Note ) MC: User has completed cloud configuration. Not showing UI again.

May 15 17:30:37 iMulp6 itunescloudd[164] <Notice>: (Note ) MC: User has completed cloud configuration. Not showing UI again.

May 15 17:30:37 iMulp6 wifid[37] <Notice>: WiFi:[453400237.757028]: __WiFiManagerCellularTransmitCallback_block_invoke: Cellular Transmit Started = TRUE

May 15 17:30:37 iMulp6 wifid[37] <Notice>: WiFi:[453400237.810430]: WiFi unquiescing requested by "locationd"

May 15 17:30:38 iMulp6 CLTM[20] <Error>: CLTM: _subscription 0x0, _subscribedChannels 0x0

May 15 17:30:43 iMulp6 CLTM[20] <Error>: CLTM: _subscription 0x0, _subscribedChannels 0x0

May 15 17:30:48 iMulp6 CLTM[20] <Error>: CLTM: _subscription 0x0, _subscribedChannels 0x0

May 15 17:30:48 iMulp6 itunescloudd[164] <Notice>: (Note ) MC: User has completed cloud configuration. Not showing UI again.