disable serial

nano /boot/cmdline.txt

remove console=ttyAMA0,115200 kgdboc=ttyAMA0,115200

nano /etc/inittab

comment out T0:23:respawn:/sbin/getty -L ttyAMA0 115200 vt100

sudo apt-get update

sudo apt-get install ppp screen elinks

screen /dev/ttyAMA0 115200

AT command should return OK

sudo -i

cd /etc/ppp/peers/

wget https://raw.githubusercontent.com/adafruit/FONA_PPP/master/fona

edit config to below

# Example PPPD configuration for FONA GPRS connection on Debian/Ubuntu.

# MUST CHANGE: Change the -T parameter value **** to your network's APN value.

# For example if your APN is 'internet' (without quotes), the line would look like:

# connect "/usr/sbin/chat -v -f /etc/chatscripts/gprs -T internet"

connect "/usr/sbin/chat -v -f /etc/chatscripts/gprs -T http://fast.t-mobile.com"

# MUST CHANGE: Uncomment the appropriate serial device for your platform below.

# For Raspberry Pi use /dev/ttyAMA0 by uncommenting the line below:

#/dev/ttyAMA0

# For BeagleBone Black use /dev/ttyO4 by uncommenting the line below:

#/dev/ttyO4

# Speed of the serial line.

115200

# Assumes that your IP address is allocated dynamically by the ISP.

noipdefault

# Try to get the name server addresses from the ISP.

#usepeerdns

# Use this connection as the default route to the internet.

defaultroute

# Makes PPPD "dial again" when the connection is lost.

persist

# Do not ask the remote to authenticate.

noauth

# No hardware flow control on the serial link with FONA

nocrtscts

# No modem control lines with FONA.

local