I have Already bought Huawei UMG 1831 3g modem from one of the famous sellers.but that piece was faulty and was restarting every 5-10mins.so i sent it back for refund.now i have decided to buy it from another seller.So can you guys please suggest me some seller who is Trust worthy and is even willing to replace/refund if the modem is faulty. Please suggest me who is best based on your personal experience because i dont want to burn my hands again as i already did ...