Yes, it is possible that you have received a cellular number that recently and previously was assigned to someone else. Keep in mind these erroneous calls may subside if you give it some more time. If not, then indeed- calling up customer support with Tracfone may be a way to determine if they can assign you another cellular number. If it's always Tracfone trying to market you more services and/or minutes, there may be a way for you to 'opt out' of such telemarketing calls. If not, changing prepaid providers may be another way to avoid this nuisance.
When a handset is 'locked', it means a specific key command, or series of key commands is required to 'wake up' the phone so you can dial a number, etc. This is a method of avoiding accidental dialing. The phone isn't off in the sense that you cannot receive calls from others, it just won't dial w/o first pressing the unlocking sequence.
While it's true that you use your minutes when calling, you aren't using 'double minutes' on the other end. You will however have minutes deducted when someone calls you. The only U.S. provider that I am aware of that doesn't charge for incoming calls/minutes is U.S. cellular, but that' s postpaid, not prepaid service. (=$$$).
Using apps (applications) on smartphones/cell phones doesn't use up minutes but if the application requires a data connection, that uses up part of your monthly allotment of data. Typically for postpaid plans this is around 2GB per month. Keep in mind all apps don't require internet to use. For example, many games don't need to use data, they are simply installed on the device and used as desired.
Guess i am what they call a Johnny come lately sort. I finally bit the bullet and bought a Samsung T301G prepaid plan, to try it out. Getting "LIVE" support is next to nil...so I hope I can get some insight in cellphones here. If not, perhaps you can steer me in the right direction. As for the phone, i mainly keep it for emergency's, as a senior. ..hoping of course never to need it. No one has the phone number that i have with it..no one. Now, that being said, I keep hearing it ring from time to time and when i check to see the call wait number, they are of course not familiar. The one rare moment i was able to get a live support and mentioned this, the girl said perhaps giving me another number may help. it didn't..Out of curiosity i called one of those numbers and it was coming from Tracfone ( my company ) trying to get me to buy more minutes. ..so i am assuming that is why i keep getting calls. I also see when i do try to see the time on my phone, I see that i have to unlock it. It seems when not in use, it locks itself. If that is what is happening, then how can someone call me, including Tracfone? Also I found that if I should ever use it, I am being charged minutes not only for my call, which is understandable, but I am also paying the recipient's time. That is a bummer. Is this true for all cellphones? Finally, those more expensive phones that have many app's as they are called...do you use up minutes by utilizing them? Thank you.