Ensure Cellular Data is Enabled Look at the top of your iPhone screen and if you see the word LTE or 4G there, it means cellular data is on. In case you do not see one of these words, enable cellular data from the iOS Control Center or the Settings app.
The 1X means you can't get a better signal for the 3G and LTE networks. 1X may give you voice service if your phone is capable of getting enough of a signal. It's usually good only for a very short text SMS. The Verizon 1X network is eventually going away as they've indicated.
If your iPhone 11 Pro Max keeps on losing the 4G LTE signal, it might be because of overloaded resources. This can happen when your iPhone has been running for a long time. To fix this, you need to offload the accumulated tasks on your device. You can achieve this by doing a device restart.
Depending on the wireless carrier, 4G can indicate either a UMTS or LTE connection. If your carrier doesn't support VoLTE and is a CDMA carrier, you'll only see an option to Enable LTE. This allows cellular-data use over the LTE network when available.
iPhone 12 5G not working with Dual SIM mode In the same support document mentioned above, Apple shares that if you're using Dual SIM mode with an iPhone 12, both lines will revert to 4G LTE.
AT&T uses "4G" to indicate the HSPA+ network, which is older and slower than LTE. It was kind of a sales gimmick that enabled them to say their verison of the iPhone 4S, unlike their competitors, was "4G capable".
E stands for Edge, aka 2G data service. You could say E = slow. There's few areas left in the country (maybe none by now) where T-Mobile offers only 2G service. Probably everywhere there's a T-Mobile signal at least 3G service is available.
Your friend is correct that 4G (HSPA+) is not the same as LTE. In general, LTE has shorter range but enables significantly faster data speeds than plain old 4G (hence its name, Long Term Evolution). To enable LTE, go to Settings -> Cellular Data Options -> Enable LTE and choose either Data Only or Voice and Data .
When you see the LTE symbol on your device, that means you're connected to an LTE network, as opposed to 2G EDGE, 3G, etc.
"4G" is what AT&T calls HSPA+. It's a slower, older protocol than LTE. If you've reset the network settings, the next steps would be to restore from a backup, then to restore as new. AT&T and T-Mobile have a "4G" which is really and enhanced 3G if LTE isn't available.
Cellular Always Overrules Wi-Fi: If it is showing LTE - then that means Cellular data is enabled. So, even if Wi-Fi is enabled along with Cellular, then Cellular is what will always be used. It will flip to Wi-Fi if and when Cellular is lost. This is because Cellular always overrules Wi-Fi.
4G and LTE are just a syntax difference. Some phones show 4G and others show LTE. Some will even show LTE instead of HSPA+. It's a bit weird, but you shouldn't see a practical difference just because the name of your data speeds changed.
Seeing EDGE on a 4G LTE Subscription If you are at a location where signal strength is weak, your mobile phone will automatically connect you to a 2G or 3G. EDGE could simply mean that your mobile phone could not link to a modern tech or the signal strength was not strong enough.
Owners of the iPhone 8 or newer on AT&T will see a new "5G E" symbol on the top-right corner of their phones after updating to the latest version of iOS that rolled out Monday. The 5G E symbol replaces the "LTE" symbol that used to be there.
In case you are having trouble connecting to the network using LTE, you can try switching to other network bands like 3G or 4G network. To do so, head over to Settings-> Cellular-> Cellular Data Options-> disable LTE and then select other network bands like 3G or 4G.
Update your iPhone or iPad to the latest version of iOS or iPadOS. Go to Settings > Cellular. Then: For iPhone, tap Cellular Data Options, then turn on Enable LTE.