“17  Absent Subscriber. IMSI detached.” — is a GSM (Global System for Mobile Communications) MAP error code, specifically MAP error code 17. Here’s what it...

“18 Absent Subscriber —  Roaming restriction.” refers to a GSM / SS7 network error code (often seen in MAP signaling or SMS delivery reports). Here’s a bre...

The message “Facility Not Supported for SMs” typically means that a short message (SMS) operation you’re attempting to perform is not supported by the mobil...

What “Absent Subscriber for SMS” Means In GSM/SS7 networks, when an SMSC (Short Message Service Center) tries to deliver an SMS, it queries the HLR (Home L...

If you’re getting the error “Number not registered in network for SMS”, it usually means that the mobile number isn’t properly recognized by the network for...