You can search by area code there and it works well.

With mobile number portability, etc.

In the advanced search, you can search for your area, such as "United States" & Boston. You can also enter a location in which you are interested (such as Logan if you want Logan airport). I haven't tried it, but TER appears to let you save searches. I'm not sure if it is the query (so that you can repeat it) or the search results.

I would also suggest narrowing you search results a bit (try it without and see how many you get) whether you use physical features or scores for appearance/performance. Start lower than you think and go from their.

Finally, for advanced search, make sure that you set values for (they're at the top of the advanced search page):
   sort by (sorts the results by date of review, appearance, etc)
   show online providers only (obvious)
   exclude bad websites (excludes old and outdated sites)
   exclude bad phone numbers (same)