How did BELL_WIFI and 5099251212 get on my Z10?

These two saved (not by me) networks suddenly appeared on my Z10. I had been with Rogers for mobile and had Bell as my ISP. Switched to Virgin Mobile and dropped Bell, updated to 10.2 OS and a short time later noticed these two stray networks. I can disable them but not delete them. When I remove the SIM card they disappear and I'm left with the wifi networks I've configured. Reinsert the SIM and they're ba-ack. Downgraded to 10.1 OS and they're still on board. Virgin support condescendingly suggested that I must have inadvertently saved some networks to my SIM. Got a new SIM card...STILL aboard. Any idea how they got there and how to delete them?

I think it has something to do with the free wi-fi offered with them at Starbucks and McDonald but I might be wrong

I'm with bell and have them both too

Posted from my Canadian PassportSQW100-1/10.3.1.1016