New iphone 11 drops calls

Hi mewkiss.

If you are already working with Apple Engineering, you are at the highest level of support available. One thing you may want to explore with them is environmental issues. You mention being close to two towers. Does this behavior persist if you move to a location where you are not close to two towers?

Whenever two sources of wave transmissions (and this applies to sound or light or the radio waves that your iPhone uses) are close to each other and the waves from each source collide, it sets up an "interference pattern." This results in some waves increasing in strength and others being cancelled out entirely depending on where each wave was in its up-and-down formation cycle when the waves collide. With sound waves, this results in a phenomenon that you can actually hear called "comb filtering" where some frequencies are cancelled out entirely and two audio source can actually sound less "full" than a single source unless the two sources are placed properly to minimize this filtering effect. The same phenomenon with light was part of Einstein's observations that resulted in the Theory of Relativity. With radio waves, it can mean something called "intermodulation distortion." And intermodulation distortion can definitely cause drop-outs. I've personally experienced this when using multiple wireless microphones on a stage if they are transmitting in the same frequency range and are too close to each other.

If the issue does not persist in a different location away from those two towers, that may help isolate this to an environmental issue.

Cheers.

Hi mewkiss.

At this point, continuing to work with Apple Engineering and Sprint will be your best paths forward. Have a brilliant rest of your day.

Cheers.

Hello mewkiss and welcome to Apple Support Communities.

I see you are having an issue with dropped calls on an iPhone 11. It also appears you may have been having similar issue on a previous iPhone XR.

With this being reported on two different devices, it tells us that the issue is either 1) software or 2) carrier-related.

Was the iPhone 11 set up using a backup made on the iPhone XR?

If it was, you'll want to create a new backup and use the steps in the article below to restore via iTunes. This method ensures that a completely fresh version of iOS is installed on the device. 

How to back up your iPhone, iPad, and iPod touch - Apple Support

If you can't update or restore your iPhone, iPad, or iPod touch - Apple Support

When you do the restore, initially set the device up as new, without restoring the backup. Use it that way for a bit to see if the issue with the dropping calls is resolved. Once you know if it's resolved or not, do the process again and this time apply the backup. If the issue is resolved when the device is set up as new but returns when the backup is restored, then you'll know the issue is something in the user data. If it's resolved both when set up as new and with the backup restored, then the issue was one that just required re-installing iOS. If it's not resolved either when set up as new or when restored to backup, then it's likely a carrier issue. 

Cheers.