Setup manually GCI APN Settings for your device. This is GCI Internet APN Settings which is updated. Here I share a complete guide and step by step process.
GCI APN Settings
GCI APN Settings

GCI APN Settings for Android

Android device needs GCI apn set up. Here we share all the information about that apn. And also share with you how to settings apn on your phone.

How to setup GCI APN Settings on Android?
In your Android mobile/Tab Go to Settings > More >Cellular/MObile Network > Access point Names > + ( to add)
Then fill up the below information...

Name : GCI
APN : web.gci
Proxy : Not Set
Port : Not Set
Username : Not Set
Password : Not Set
Server : Not Set
MMSC : http://mmsc.gci.net
MMS Proxy : 24.237.158.34
MMS Port : 9201
MCC : 310
MNC : 370
Authentication Type : Not Set
APN type : default,supl,mms (or – for some phones) Interne + mms
APN protocol: Ipv4
APN roaming protocol: Ipv4
Enable/disable APN: APN Enabled
Bearer: Unspecified
MVNO type : None
MVNO Value : Not set
GCI APN Settings for Android
GCI APN Settings for Android

GCI APN Settings for iPhone

All the iPhone need apn settings. GCI also share their own apn settings for iPhone. Follow the below process...

How to setup GCI APN Settings for iPhone or iPad?
In your iPhone mobile go to Settings> Cellular> Cellular Data Network> APN and fillup the below information.

Cellular Data:
APN: web.gci
Username: Blank
Password: Blank
MMS:
APN: mms.gci
Username: blank
Password: blank
MMSC: http://mmsc.gci.net
MMS Proxy: 24.237.158.34:9201
MMS Message Size: 1048576
MMS UA Prof URL: blank

GCI network frequencies 

2G - GSM 1900 MHz, CDMA-850 CDMA-1900, GSM 850 MHz
3G - UMTS 1900 MHz, CDMA-850 CDMA-1900, UMTS 850 MHz
4G - LTE Band 4 1700/2100