Why would someone want to switch SIM cards? I was getting notification that my sim had one too many numbers possibly. Then when doing chk on friend, his phone number came back as dba federal something or other can't remember it all. I asked him and no response. Later I notice my sim has markings where it had been removed. It was new phone and I don't use ink pens to remove so had to have just been done while I was sleeping. When I do a sim analysis on his and mine both come back SSi connexions Canada then Guam then another then Verizon US. Now chking phone numbers his registers to KC MO metro pcs and mine to cellco partnership dba Verizon. Similar to what his said at beginning of all this. The whole dba thing to me looks like they are scamming ppl. I'm worried as to why my phone is coming back as that now. Why would he have changed Sims and what does all this mean?