The 3131, long associated with recalling the last caller on a landline, is no longer accessible on most recent installations. Its disappearance is not merely due to a change in short number: it accompanies the phasing out of PSTN and the migration to VoIP infrastructures where this type of network code is no longer technically supported.
SIP Protocol and the Abandonment of Network Codes: Why 3131 No Longer Works
The 3131 relied on signaling specific to the analog PSTN. The local switch stored the number of the last unanswered incoming call and provided it through a dedicated voice service. On a VoIP line connected to a box, SIP signaling does not support this mechanism.
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The box itself manages call routing, caller ID (CLIP), and call log storage. The code 3131, even if technically dialable on some handsets, results in a busy tone or an error message. We observe this behavior on both fiber and ADSL lines in total unbundling.
The PSTN shutdown plan led by Orange accelerates this obsolescence. As the NRA switches to all-IP, historical voice services (3131, as well as other short codes related to call management) cease to function without being replaced by an equivalent number. Identifying the number that replaces 3131 implies understanding that the replacement is functional, not numerical.
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Call Log of the Box: The Concrete Replacement for 3131 on Landline
The replacement for 3131 is a menu function, not a code to dial. On recent boxes from Orange, SFR, Free, and Bouygues Telecom, the call log integrated into the handset or the box’s web interface lists missed calls with timestamps and calling numbers (when caller ID is active).
Access via the DECT Handset Provided by the Operator
Most handsets associated with boxes have a direct key or a sub-menu “Last Calls” / “Log”. Missed calls appear there with a specific icon. The storage capacity varies by model, but it far exceeds just the last call that the 3131 provided.
Access via the Web Interface or Customer Space
Orange offers consultation via the online customer space or the app. Free displays the log directly in the Freebox interface (Freebox OS). SFR and Bouygues integrate an equivalent section in their subscriber space. Each operator has its own ergonomics, but the principle remains the same: call data is stored on the box side or operator server side, and retrieved via a graphical interface.
- Orange: voicemail at 3103 for messages, customer space for missed call log
- Free: Freebox OS interface accessible from a browser on the local network, section “Telephony”
- SFR: web customer space or SFR & Me app, fixed telephony section
- Bouygues Telecom: Bbox customer space, “Calls” tab
We recommend checking that caller ID is activated in the box settings. Without CLIP activation, the log will display “hidden number” or “unknown” for each incoming call, making the function as useless as the old 3131 in the face of a hidden number call.
Missed Calls on Smartphone: The Issue of Mobile 3131 is No Longer Relevant
On mobile, the 3131 never had a widespread equivalent beyond certain historical Orange plans. The native Phone app (Android or iOS) has fulfilled this function for years. The “Recents” or “Log” tab displays the complete list of missed, received, and outgoing calls.
For subscribers who used 3131 via their landline and are migrating to a fully mobile usage, the change in reflex is simple: open the Phone app, filter by “Missed”. Unknown numbers can be reverse searched directly from the Google Phone app on Android.
Identifying Unknown Numbers on Mobile
The Google Phone app includes a reverse search function that queries its database to associate a number with a business name or public contact. This function requires Android 6.0 or later, and the Google Phone, Contacts, and Messages apps must be installed.
On iOS, reverse search is not native, but third-party apps offer this service. Spam call filtering can be activated in Settings > Phone > Call Blocking & Identification.
Voicemail 3103 at Orange: Do Not Confuse with 3131
A common confusion is to consider 3103 as the direct successor to 3131. The two services do not serve the same function. 3103 is the access number for Orange voicemail on landline: it allows listening to messages left by callers, not consulting the list of missed calls without messages.
The 3131 identified the last caller even if they did not leave a voicemail. The 3103 only retrieves calls that went to voicemail. To find a missed call without a message, only the box log or customer space provides this information.
- 3131 (old): last unanswered calling number, with or without voicemail
- 3103 (Orange, still active): access to fixed voicemail, only calls with message deposit
- Box log: all incoming calls, missed or answered, with timestamps
The distinction is important for subscribers who receive calls without messages and relied on 3131 to retrieve the number. The call log of the box is the only tool that exactly replicates the function of 3131.
The transition from 3131 to the box log marks a change in usage rather than a change in number. Subscribers accustomed to picking up their handset and dialing a short code must now navigate a menu or log into a web interface. For landlines still connected to a non-migrated NRA, 3131 may temporarily work, but its availability decreases with each new switch to all-IP.