I have restored the first device to factory settings and set up as new, replaced the SIM multiple times, then Apple also replaced my iPhone, and the issue persists with the second iPhone. What do I do at this point? This happened suddenly a couple weeks ago.
I understand the problem occuring with the first iPhone, but with a replacement device, I'm not believing it's the phone anymore. Countless diagnostics from Apple show that my antenna is not defective.
All over the city LTE will be spotty and I'm from London. I have to be reliant on 3G.
I understand that you're having an LTE issue with your iPhone. Rest assured that the community is here to help with this.
Before you replaced your iPhone, was it a Fido phone that you bought with us? Have you tried as well to use the SIM card in another compatible phone to see there's any changes?