I just got the Novael mifi 4082 from Sprint. my house is on the edge of 4g. My 3g signal is -64 where as my 4g is -120. I can get a strong 3g signal all the time, but I can only get a 4g signal 5% of the time. Is there another Sprint device that has a better antenna. I have only his mifi4082 for 4 days so I can take it back. Can any body offer me any help?