Phone Number matches incorrectly

I've had numerous false positives with the phone number regex that are obviously wrong. All of these match:
```
0000000000000
0123456789
3333333333333
3333333333
4444444444444
22223333333
-1606586780
```
The last one is potentially valid but `-1` is not valid in a phone number. `+1` is. If it can't be less broad then make the rarity `0`.

Locate the phone-number regex and any related tests, then reproduce the listed false positives. Verify that the invalid examples no longer match, while a valid +1-prefixed number remains supported; add or update regression coverage for these cases.

Written by the indexing model from the issue text.