Blocking fringe calls from other international cell towers

Unfortunately, iPhones itself don't have a built-in option to specifically block signals from certain cell towers. Here are a couple of options you can explore to avoid these unwanted charges:

1. Manually Select Verizon Network: Your iPhone might be automatically trying to connect to the strongest signal available, which could be the British Virgin Islands tower in your case. You can try manually selecting the Verizon network. Here's how:
   1. Go to Settings > Carrier.
   2. If available, try selecting "Verizon" or a similar option that specifies the US network.
   3. Note: This option might not be available on all iPhone models or iOS versions.
2. Contact Verizon: Verizon might have options on their end to restrict your phone from roaming on international networks, even if they're close by. Contact Verizon customer support and explain your situation. They might be able to:
   1. Apply a setting on their network to restrict international roaming.
   2. Offer a specific plan that excludes international roaming charges.
3. This setting allows your phone to connect to cellular data services offered by networks outside your home carrier's network. In your situation, this includes the British Virgin Islands towers. Disabling it prevents your phone from using any data services on those networks.