bro .Samsung never provide ca service on m series old phones. i know there's so many m series phones which processor support carrier aggregation .but this phones ui is core version. so there is no option to add carrier aggregation on one ui core devices. better to go with a-s series or Chinese brand.
and if you really Want to improve your internet speed .try to download Samsung band selection app and try to lock specific band according to your area .this is definitely helps you .for more information about this go and check out on youtube there is so many videos available regarding band selection on Samsung
Continue flooding samsung with feedbacks, and follow es_techno on twitter, https://mobile.twitter.com/es_techno He is going to start a trend soon to get ca in m51. Also, vote "No" if you are dissatisfied with samsung. We all need to gather together and then ask samsung for CA.
We would request you to register your concern in Samsung Members Application. So, that our concern team gets back to you as soon as possible.
Please follow this path to register your concern in Samsung Members Application (Open Samsung Members Application > Get help > Send Feedback > Error report/Ask questions).
Note. please attach the error log file within 15 minutes of the error occurred.
