I appreciate everyone's responses. I am a brand new owner with a lot to learn–fun!
Handle
Russell wrote: If the fob is left in the car and the handles retract, the car is not "locked". Just tap the door handle and it will open.
ecarfan wrote: So are you saying that with your fob in the car and the handles retracted, when you touched the handle to get it to extend it did not extend? Or did you simply not try touching the handles and assumed the car was locked?
1MoreUsername wrote: Please note that on newer model vehicles you need to do more than touch the handles. The handles require a firm press inward then the handles will extend.
My response: After seeing the key fob inside the car, I in fact touched the driver's handle, but it did not extend. I'm glad to learn now that when the handles retract, the car is not locked because I had heard that when it's set to Auto-lock, I could walk away from the car and it'd lock itself. I left in a parking lot a few times that way. After reading the above I went to my car, put the key fob inside on purpose, went away, and waited for the handles to retract. I approached the car, touched the driver's handle, but got no reaction. I pressed the handle with greater force, but it still did not extend. Then I went to the back seat handle, touched it, and the handles presented themselves for opening. I'm glad the back door handle presented, but why not the driver's door?
Key fob-phone interaction
Az_Rael wrote: I have heard that if the fob is near a cell phone when left in the car, (say, in a purse), that you could get locked out.
My response: My iPhone was not in the car, so there was not interaction with the key fob.
Tesla app on the phone
DrReid wrote: If the key fob and your phone were both truly locked inside the car, you just need someone else to download the app onto their phone. You can sign in on their device and unlock the car.
My response: I didn't try to open the car with the phone app, since my other key was nearby. However, I wondered about the hypothetical situation if both items were left inside unintentionally and car and I were in a remote place. I am hopeful that if that were to happen, I'd be among other friendly Tesla drivers with smart phones. Or just any other friendly person with a smart phone, patience, time, and willingness to help. And cellular or wifi service.
Trunk
Akikiki wrote: There's a chance the trunk is unlocked (when the fob is locked inside the doors) So go try the trunk. If it unlocks the worse is you have to crawl through the space to get to the doors. Can't guarantee when the trunk is going to be unlocked in this situation, but it does occur.
My response: I did not try opening the trunk. I have never thought of climbing into the trunk, or know that it's possible to crawl through the trunk into the interior of the car. However, after reading your response, I did open and climb into the trunk. I have discovered how roomy the trunk is and how to unlatch the back seats so as to climb through. Of course, as mentioned, this solution can work only if the trunk latch is unlocked.
Turning features on/off
Az_Rael wrote: My “solution” was to turn off walk away lock.
My response: I realize I can turn it off, and I probably will for peace of mind. I just thought Tesla is such an advanced technology company that it would be able to address these issues in engineering or software.
Connectivity
iluvmacs wrote: Better hope both the phone and the car have connectivity! I drive in areas pretty often where one or both are lost.
My response: I can see how if the phone battery is dead, one wouldn't be able to connect. But assuming both have battery, do the car and the phone both need to have cellular service to connect?