My mother has Cricket service and has commented that she either has 4GLTE or 4G but no 3G, 2x, etc. If her 4G data drops off, for example, it does not go to 3G, 2X, etc....it goes to no data at all. This can happen when in a good coverage area. She has 5G of high speed LTE and never goes over that limit. The customer rep said that her data will not drop down to 3G coverage and all she will get is either 4GLTE or 4G? Is this true or is the rep full of it?