You have been blocked. But unlike an iPhone, where a simple trip to Settings reveals a list of silenced contacts, a landline is a labyrinth of carrier codes, star codes (star codes are special sequences of keys on your phone's keypad that start with the star (*) button), and decades-old telecommunications infrastructure.
Have you ever been blocked by a landline? Did the star codes work for you, or did you have to resort to snail mail? Let us know in the comments below. how to unblock a number landline
Here is the deep, technical, and practical guide to reclaiming your connection. First, unlearn everything your smartphone taught you. On a mobile device, you control the block list. On a traditional landline (POTS—Plain Old Telephone Service), the person who blocked you controls everything. You cannot “force” an unblock from your side. You have been blocked
If you call from a friend's phone and it goes through, but yours doesn't, it's a local block on their physical machine. Did the star codes work for you, or
What you are actually doing is masking your identity or removing a carrier-specific trap . There are three distinct scenarios for a blocked landline call, and your solution depends entirely on which one you are facing. This is the most common for personal lines. The person you are calling (let’s call them "The Recipient") has a call screening feature through their carrier (Verizon, AT&T, BT, etc.). They entered your specific number into a "Reject List."
You try to call three different landlines in three different area codes. All of them give you a similar "This number is not in service" or "Call cannot be completed as dialed" message.
You call. It rings once (or not at all), then goes to a fast busy signal or a specific recording saying the subscriber is not accepting calls.