After viewing all these reviews, it seems that those things aren't really working.
Feel free to let me know.
Below are my researches:
Thanks TechDaily for the good review
Reach79 iPhone 6/6 Plus Case Review - Get Faster Downloads Better Signal and Improved Battery Life
iPhone 6 Signal Booster
Thanks Anthony Smith for the upload
How To: DOUBLE LTE Data Signal on iPhone 6 & 6 Plus!
Introducing Reach Antenna - Attachable Antenna
Thanks ReachAntenna for the upload
Reach Antenna iPhone 6 Plus Long Review
Thanks Tech TECHADDICTION for the upload
Reach Antenna - Attachable Antenna - Review
Thanks Babu for the upload
You can read this too on cnet and those other websites:
I saw this on amazon but according to the reviews, it's not terrible:
Where to buy the other products above:
But I can't assure it will work, it didn't work on mine.....