Error 38 on Free Mobile refers to a failure in SMS routing at the messaging center (SMSC). The phone attempts to send the message, but the network rejects it before it reaches the recipient. This generic code covers several distinct situations, from a simple configuration issue to an active block on the operator’s side.
Understanding the mechanics behind this rejection allows for the correct fix to be identified on the first try, without wasting time testing unnecessary manipulations.
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Anti-spam filtering and error 38: the block that most guides overlook
Since 2023-2024, operators including Free have strengthened their automated filters against fraudulent SMS. This tightening, encouraged by ANSSI and the interministerial plan to combat SMS scams, has a direct side effect on legitimate subscribers.
A message containing a link, a keyword with promotional connotations, or sent in bulk can trigger a network-side block interpreted as error 38. The phone displays a code identical to that of a poorly configured SIM, while the issue originates from upstream filtering at the SMSC.
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Specifically, if you have attempted to send several identical or nearly identical SMS to different recipients in a short period, Free’s anti-flood system may temporarily halt sending. The solution is to wait one to two hours before retrying, sending a unique message without a link. To resolve error 38 sms Free in this specific case, no technical manipulation is necessary.
Free SMS center number: check the SMSC setting
Every SMS passes through a relay server identified by a number. On Free Mobile, this number is +33695000695. If this setting is absent, modified, or corrupted, the phone does not know where to route the message and returns an error 38.
Accessing the SMSC setting on Android
The procedure varies depending on the manufacturer’s overlay. On most Android phones, the path goes through the Phone app (the dialer), by dialing the code *#*#4636#*#*. A hidden menu appears. In the “Phone Information” section, the “SMSC” field displays the messaging center number.
If the field is empty or contains a different number, enter +33695000695 and confirm. This setting may reset after a system update or a SIM card change.
On iPhone
Apple does not provide access to the SMSC from the settings. The number is typically read automatically from the Free SIM card. If the error persists on iPhone, the issue rarely comes from the SMSC itself but rather from the SIM or the network.
SIM card and number formatting: two common hardware causes
A physically damaged SIM card, improperly inserted, or too old can cause intermittent sending errors. The reference test is simple: insert the SIM into another phone and attempt to send. If the error disappears, the problem lies with the phone. If it persists, the SIM is at fault.
Free provides replacement SIMs from the subscriber area. SIMs that have undergone multiple cuts (from standard to nano, for example) are more prone to poor contacts.
The formatting of recipient numbers is another common trap. Since the tightening of validation rules on the operator side, poorly formatted numbers are more often rejected at the SMSC. A number recorded without the international dial code (+33) or in an exotic format may be refused. Delete the affected contact, recreate it with the format +336XXXXXXXX or +337XXXXXXXX, and then try again.
Network reset and update: software fixes
When the SMSC setting is correct, the SIM works on another device, and the problem does not stem from bulk sending, there are two software avenues to explore.
- Reset the network settings of the phone (Settings > System > Reset > Network settings). This operation clears saved Wi-Fi, Bluetooth, and mobile data configurations, then forces the phone to reconnect properly to the Free network. Wi-Fi credentials will need to be re-entered.
- Check that the operating system and messaging app are up to date. Some versions of Android have documented bugs regarding SMS protocol management, which have been fixed by subsequent security patches.
- Activate and then deactivate airplane mode for about thirty seconds. This manipulation forces a complete re-registration on the mobile network and may be enough to unblock a rejected send.
Error 38 abroad: roaming and plan restrictions
Sending SMS from abroad adds a layer of complexity. The phone must switch to a partner network (roaming), and the SMS passes through Free’s SMSC in France before being routed.
Two checks are a priority. First, data roaming must be enabled in the phone settings (Settings > Mobile Network > Roaming). Without this activation, some smartphones also block SMS sending, not just data.
Next, not all Free plans cover sending SMS from all destinations. A plan at 2 euros per month does not offer the same guarantees as a plan at 19.99 euros regarding roaming. The Free subscriber area allows you to check the exact conditions related to your offer and destination.
When to contact Free support
If after checking the SMSC, testing the SIM on another device, waiting for the lifting of any anti-spam block, and resetting the network settings, error 38 persists, the problem likely lies with Free’s infrastructure. A local SMSC outage or a restriction applied to your line requires intervention from customer service.
Before calling, note the exact time of the failed send attempts and the numbers of the affected recipients. This information allows support to trace the rejection in their logs and quickly identify whether it is a security block, a sector outage, or a problem specific to your account.