T-lock Call Blocker Version 5.0 Blocks up to 1,500 incoming and outgoing phone numbers in BLACKLIST (up to 16 digits). Also, it can block up to 10 area codes or prefixes.One Touch BLACKLIST operation. 12-month access to HQTelecom's Virtual BLACKLIST. With the purchase of this call blocker, you will also get 12 month unlimited access to our new Virtual BLACKLIST. Search a database of 30 million unsolicited phone numbers to identify phone numbers linked to scams and frauds.