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Any ideas on why or how to fix poor 4G LTE signal strength? I only have one bar of signal strength throughout my whole house, lucky if I have 2 bars outside the house. I switched my iPhone to use 3G and I get full bars with 3G inside my house. I figured it was my iPhone SE 2nd Gen, so I upgraded to the iPhone SE 3rd Gen but still have the same poor cell reception. 
 

Indoor signal is always a challenge for phones as cellular signal need to travel through partitions. You just can’t beat the physics laws easily. If you had issue with indoor signal and you are a postpaid customer, try to use wifi calling https://www.koodomobile.com/en/help/wifi-calling

Also, 3G and 4G are 2 different systems, sometime 3G signal is stronger, phone could switch to it for optimum condition.