buat file baru.. contoh 'net.conf' tanpa tanda petik..
lalu masukan ini kedalam file tsbut

net.ipv4.conf.all.accept_redirects=0;
net.ipv4.conf.all.accept_source_route=0;
net.ipv4.conf.all.rp_filter=1;
net.ipv4.conf.all.secure_redirects=0;
net.ipv4.conf.default.accept_redirects=0;
net.ipv4.conf.default.accept_source_route=0;
net.ipv4.conf.default.rp_filter=1;
net.ipv4.conf.default.secure_redirects=0;
net.ipv4.icmp_echo_ignore_all=1; 
net.ipv4.icmp_ignore_bogus_error_responses=1;
net.ipv4.ip_forward=0;
net.ipv4.ip_no_pmtu_disc=0; 
net.ipv4.route.flush=1;
net.ipv4.tcp_congestion_control=cubic;
net.ipv4.tcp_ecn=0;
net.ipv4.tcp_fack=1;
net.ipv4.tcp_fin_timeout=15;
net.ipv4.tcp_keepalive_intvl=30;
net.ipv4.tcp_keepalive_probes=5;
net.ipv4.tcp_keepalive_time=1800;
net.ipv4.tcp_max_syn_backlog=1024;
net.ipv4.tcp_max_tw_buckets=16384;
net.ipv4.tcp_moderate_rcvbuf=1; 
net.ipv4.tcp_no_metrics_save=1
net.ipv4.tcp_rfc1337=1;
net.ipv4.tcp_rmem=4096 16384 404480;
net.ipv4.tcp_sack=1;
net.ipv4.tcp_synack_retries=2;
net.ipv4.tcp_syn_retries=2;
net.ipv4.tcp_syncookies=1;
net.ipv4.tcp_timestamps=0;
net.ipv4.tcp_tw_recycle=1;
net.ipv4.tcp_tw_reuse=1;
net.ipv4.tcp_window_scaling=1;
net.ipv4.tcp_wmem=4096 16384 404480; 
net.ipv4.udp_rmem_min=6144;
net.ipv4.udp_wmem_min=6144;

>>>setelah udah.. save.. smpen ke /system/etc/disini
>>> setperm rw-r-r aja
>>>terus bikin file baru.. contoh 'cek' tanpa tanda petik..
lalu masukan ini kedalemnya

#!/system/bin/sh

sysctl -p system/etc/net.conf

>>>simpen ke folder init.d atau xbin.. set permission jadi rwxrwxrwx alias centang semua

work on stock rom.. inet smartfren inet gsm indosat edge..
GSM lain?? coba aja..