@rajeshkatiyar
I have also used LG Handsets for NetConnect but RD 2330,2430,2550,2670 etc... doesn't have more than 18kps speed(No Special Hardware Modem Circuitry Present).
Speed range: Generally in Night after 1.00 AM
80 to 98 kbps = RD2030,2130,2230,5340 etc.. All Nokia 2280,2112 (No USB Modem)
100 to 144 kbps = RD5130,6130,6230,6330 etc.. (USB Modem)
u can identify in the Phone Menu> Data setting>Data Baud option: If there is USB Modem option present then it supports Super High speed Internet of 144kbps.
if 115200 and 230400 are present then it supports High speed Internet of below 100kbps.
Use Only USB Cables with USB Modem Phones.