Using an iPhone 5s & have a 4 out of 5 signal strength where I am for 4G. Generally not getting any problems, but when I receive a call the network switches to 3G. This is fine, but it won't switch back to 4G afterwards - so far it has reset back during the night at some point. Therefore, if I were to receive a call in the morning, I would then have to go all day without a 4G connection.
I have tried turning 4G & Cellular Data on & off, hoping a network refresh may get the 4G to kick in again, but it just goes back to 3G. Have also done hard & soft reboots of the phone, but nothing, & this isn't exactly a practical solution any way.
Anyone else having this issue or have any tips at all?