Can the SIM card work on my new phone?

[KevKevin]

I am going to have a new phone, OPPO A79. The network is listed at the end. I am using at &t Prepaid plan now, and the phone I am using now is Smartisan U1. The network is listed below. 

Can I still be able to use my current AT &T SIM card on the new phone?

Smartisan U1

4G	TDD-LTE	B38 / B39 / B40 / B41
FDD-LTE	B1 / B3 / B7
TDD-LTE	B41
FDD-LTE	B1 / B3 / B7
3G	TD-SCDMA	B34 / B39
WCDMA	B1 / B2 / B5 / B8
EVDO	BC0
2G	GSM	B2 / B3 / B5 / B8
CDMA 1X	BC0

OPPO A79

4G+	TD-LTE	B38C/B39C/B40C/B41C/B39A+B41A
LTE FDD	B1C/B3C/B1A+B3A
4G	TD-LTE	B34/B38/B39/B40/B41(100M)
LTE FDD	B1/B2/B3/B4/B5/B8
3G	WCDMA	B1/B2/B4/B5/B8
TD-SCDMA	B34/B39
CDMA2000	BC0(800MHz)
2G	CDMA	BC0(800MHz)
GSM	B2/B3/B5/B8

[lizdance40]

It has no LTE bands for the US, but I has 3G, so calls and text will work fine once APN is programmed.   

This is not a brand we recommend because it doesn’t get LTE.  

[adidaskid808]

Another phone that will show up H+ or H++ on AT&T network
Will be a good phone to use in Asia

with working 4G LTE & dual sim, Android 7.1.1

16 MP camera front and back.

[KevKevin]

Which one will show h+? The Smartisan phone i am using now shows h+.

Also i am an international student in US college, so i do not need network that much. i just want to make sure i can still call and text someone with OPPO A79(new phone)

[KevKevin]

So I can still call and text with new phone right?

[adidaskid808 · Accepted solution]

Yes!!!
You might need the correct APN set up for data.
But your new phone are running Android 7.1.1, it should be plug and play

and no special APN setting needed.
Your new phone will also show up H+ or H++ on AT&T network (AKA 3G or 4G in North America.)
I am using unlocked phones from Asia.........they all show up as H++ when I'm using mobile data.