this is my first post concerning this issue. I was sent a brand new 4g MiFi 4510L through corporate via an upgrade from 3g. All ive had is problems. 4 days into having the device and it working as it should it started to blink green then purple. When i talked to support i got the usual gambit of doing reset and the battery take out. Also the removal of sim card.Then after all of that not working i was issued a trouble ticket to which they got back to me and said nothing was wrong with the towers or equipment. i am in a 4g area and have never had problems before. so every time i try and turn it on i get the same blink and they can not tell me anything besides i have to replace the brand new device with a refurbished one. Can some one please tell me something im not aware of. im desperate because even though my ipad or laptop does not get service somehow im getting usage charges. though small,im not even able to connect to the dang thing.HELP!!!!!