these are my build prop tweaks for connectivity
# Website Bypass
net.rmnet0.dns1=8.8.8.8
net.rmnet0.dns2=8.8.4.4
net.dns1=8.8.8.8
net.dns2=8.8.4.4
net.gprs.dns1=8.8.8.8
net.gprs.dns2=8.8.4.4
net.ppp0.dns1=8.8.8.8
net.ppp0.dns2=8.8.4.4
net.wlan0.dns1=8.8.8.8
net.wlan0.dns2=8.8.4.4
net.eth0.dns1=8.8.8.8
net.eth0.dns2=8.8.4.4
# Wireless Speed Tweaks
net.ipv4.tcp_ecn=0
net.ipv4.route.flush=1
net.ipv4.tcp_rfc1337=1
net.ipv4.ip_no_pmtu_disc=0
net.ipv4.tcp_sack=1
net.ipv4.tcp_fack=1
net.ipv4.tcp_window_scaling=1
net.ipv4.tcp_timestamps=1
net.ipv4.tcp_rmem=4096 39000 187000
net.ipv4.tcp_wmem=4096 39000 187000
net.ipv4.tcp_mem=187000 187000 187000
net.ipv4.tcp_no_metrics_save=1
net.ipv4.tcp_moderate_rcvbuf=1
ro.sys.fw.mOomMinFree4=146880
ro.sys.fw.mOomMinFree5=215000
ro.sys.fw.mOomMinFree6=398048
#net_speed_tweak
net.tcp.buffersize.default=4096,87380,256960,4096,16384,256960
net.tcp.buffersize.wifi=4096,87380,256960,4096,16384,256960
net.tcp.buffersize.lte=524288,1048576,2097152,5242 88,1048576,2097152
net.tcp.buffersize.hsdpa=6144,87380,1048576,6144,87380,1048576
net.tcp.buffersize.hspa=6144,87380,524288,6144,16384,262144
net.tcp.buffersize.evdo_b=6144,87380,1048576,6144,87380,1048576
net.tcp.buffersize.umts=4096,87380,256960,4096,16384,256960
net.tcp.buffersize.gprs=4096,87380,256960,4096,16384,256960
net.tcp.buffersize.edge=4096,87380,256960,4096,16384,256960
#internet_tweaks
ro.ril.hep=1
ro.ril.hsxpa=5
ro.ril.gprsclass=12
ro.ril.hsdpa.category=28
ro.ril.enable.a53=1
ro.ril.3g.prefix=1
ro.ril.htcmaskw1.bitmask=4294967295
ro.ril.htcmaskw1=14449
persist.cust.tel.eons=1
ro.ril.hsupa=7
ro.ril.enable.fd.plmn.prefix=23402,23410,2341
ro.ril.enable.a52=1
persist.data_netmgrd_mtu=1482
persist.data_netmgrd_nint=16
ro.use_data_netmgrd=true
ro.config.hw_fast_dormancy=1
ro.ril.set.mtu1472=1
ro.ril.def.agps.mode=2
ro.ril.def.agps.feature=1
ro.ril.enable.gea3=1
dont forget to hit thanks and like..