All fifotrack models support buffer storage fuction when the network is not available (SIM card no credit/network down/Network signal too poor, etc). The device will save the data (GPRS time interval data/GPRS Alarm data/SMS data) automatically if can't find the network, and will send out the buffer sorage data autamatically once the network recovered.
The buffer storage data uploading sequence follows up below rules:
1. The real time data always is top priority
2. Between the real time interval, will upload the buffer storage data as the FIFO sequence=First in first out=Old data send out first.
Note: After the network recovered, the device may need several hours to upload the buffer storage data competely.