The reception on this phone is awful?

I noticed since I got this phone about 3 weeks ago that no matter what, stock or custom ROM my reception is incredibly bad. I roam almost everywhere I go unless I'm home and the new place I will be moving too in a month I have to literally leave the neighborhood to do anything.
I previously had a Galaxy S4 and I never had these issues and I'm currently using the same sim card that was in that phone.

Can anyone help me?

Absolutely Awful Battery Life Wiko Rainbow

Hi everybody,

I just bought this smartphone yesterday. Ive been pretty satisfied with its overall perfomance, the screen quality, the stock android it runs. Coming from a 512mb RAM device i couldnt be more satisfied regarding this smartphone pros.

However, I simply cant stand this smartphones battery life. Its absolutely awful, dropping to 50% in 2 hours with moderate use(Chatting on FB messenger, browsing the internet, listening to music). Even if i use the smartphone lightly(only chatting), the battery still drops awfully fast. I dont consider it normal at all, because my other smartphone with 1400 mAh battey lasted MUCH better, dropping only to 70/75% battery if i used it the same way I use this phone.

Seems like no matter how lightly I use this smartphone, the battery keeps dropping like i never seen. Any help there? Ive bought this phone 5 days ago, could the battery still be "asleep"? Any suggestions?

Thank you in the advance.