Can somebody please do a signal strength comparison if you still own an older iphone along with a 12?
Testing speeds is NOT an indication of what kind of signal strength the phone is capable of receiving. You need to find out the db and the only way to do this with an iphone is by using the service menu in the phone.
If you have both an iphone 12 and an 11 or earlier (at least one from the last couple of years or so), google "how to test signal strength on an iphone." The method is different for ios14 than it had previously been, but any iphone can do it. Use SIM cards from the same carrier in each phone or swap one out if you must, but sit and watch the results for awhile. Don't make a judgement based on a couple of seconds of results. The db levels will change quite a bit over time. Unless you are consistently seeing at least a 5 or 6db difference, the signal strength capabilities are the same. The lower the number, the better the signal. But remember, you're dealing with negative numbers so something like -70db is better than -90db. Anything from -65db to -80db is a very very good signal. Anything from -120db to -130db is pretty bad. -140 would pretty much indicate you have no service.
Can anyone do this? I've been asking in various forums for almost 2 weeks now.