[Question] Lenovo k3 note 3G and 4G problem connection issue

[zravo1]

i have bought the k3 note and everything is good, except the 3G and 4G connection. i can't use internet connection with the 3G and 4G. i thought that the problem was in the sim card, but i ve tried my sim card on other phones, it works very good. the frequencies are compatible here in my country. please can you find me a solution with this issue, i think the phone have a problem with the 3 and 4G. Find me a solution please.
Thank you for your help.!
Best wishes.
P.S: take a look on the picture attached, the 4G signal is displayed on the phone but the speed connection is very bad. you can check it on the picture.