Based on the available information, it appears that the caller with the number +441873440737 has been making calls that are being perceived as suspicious, with the caller being silent and the number not being recognised when called back. This behaviour is often associated with scam calls, where the caller may be attempting to extract information or money from the recipient. The fact that the number is not recognised when called back suggests that it may be a spoofed or unregistered number, which can be used to disguise the caller's true identity.
The call was met with silence and the number was unrecognised when attempted to call back
