If you previously set up your gateway on your phone, you might run into connectivity issues. 

If your phone was once connected to the gateway’s Access point (Atom_XXXXXXXX) and remembers it.   Most mobile phones reconnect to known networks automatically.

If this is the case simply open your mobile phone’s network settings and connect back to your home network (optionally you can have the phone forget the gateway’s SSID to prevent this issue later on).