Enabling Free Mobile to detect LTE capability on the Jiayu S3S

Free Mobile sets a 3 GB usage limit for people who have a phone that doesn’t support their LTE frequencies, or when it thinks it doesn’t, because it’s the manufacturer that creates a database and Jiayu isn’t among the serious ones. My phone had that problem and customer support doesn’t really care. I had to check my IMEI on a specialised website. It’s illegal to change it but it’s the only solution found so far if the original IMEI returns the wrong frequencies.

To change the IMEI (and do so at your own risk):

• enter Engineer mode *#*#JIAYUS3#*#* (*#*#5429873#*#*)
• → Connectivity tab
• → CDS Information
• → Radio information
• → Phone 1 / Phone 2
• input in first line AT+ EGMR 1,7,"IMEI", if it’s for Phone 2, AT+ EGMR 1,10,"IMEI" (if you forget the space between AT+ and EGMR it will say “This command is not allowed in UserBuild”)
• Send AT command button, for some reason I had to press it several times for it to work
• reboot

Now login on mobile.free.fr to see if the data cap increased (20 GB on 3G networks, 50 GB on 4G networks) after you’ve connected to a LTE antenna again. If not, please send me an email because it’s the only solution I’ve found so far and it’s supposed to work.