Armor 28 Ultra Thermal Version I Epic Performance, Frontier Technology
Ulefone Armor 28 Ultra Thermal
Merchant VideoWhat is the frequency bands of the Ulefone Armor 28 Ultra?
5G: NR Sub6: N1/2/3/5/7/8/20/25/28/38/40/41/66/71/77/78/79
4G: LTE-FDD: B1/2/3/4/5/7/8/12/13/17/18/19/20/25/26/28A/28B/66/71
LTE-TDD: B34/38/39/40/41
3G: WCDMA: B1/2/4/5/6/8/19
2G: GSM: B2/3/5/8 CDMA: BC0/BC1/BC10
Which carriers is it compatible with?
Compatible with most carriers such as T-Mobile, Metro PCS, Mint Mobile and others.
Check compatibility with your local bands before purchase! (Not compatible with AT&T or Cricket)
What to do if your Armor 28 Ultra can't work with your carrier?
You need to activate the SIM card on a existing phone which supports your carrier. After you receive the initial activation texts or get 4G signal, put the SIM card back into your Armor 28 Ultra.
How to activate the virtual 16GB memory expansion?
The Virtual Memory Expansion can be activated in Settings and adds up to 16GB of RAM. Some software may not be compatible with this feature.

Armor 28 Ultra Thermal Version I Epic Performance, Frontier Technology
Ulefone Armor 28 Ultra Thermal
Merchant VideoWhat is the frequency bands of the Ulefone Armor 28 Ultra?
5G: NR Sub6: N1/2/3/5/7/8/20/25/28/38/40/41/66/71/77/78/79
4G: LTE-FDD: B1/2/3/4/5/7/8/12/13/17/18/19/20/25/26/28A/28B/66/71
LTE-TDD: B34/38/39/40/41
3G: WCDMA: B1/2/4/5/6/8/19
2G: GSM: B2/3/5/8 CDMA: BC0/BC1/BC10
Which carriers is it compatible with?
Compatible with most carriers such as T-Mobile, Metro PCS, Mint Mobile and others.
Check compatibility with your local bands before purchase! (Not compatible with AT&T or Cricket)
What to do if your Armor 28 Ultra can't work with your carrier?
You need to activate the SIM card on a existing phone which supports your carrier. After you receive the initial activation texts or get 4G signal, put the SIM card back into your Armor 28 Ultra.
How to activate the virtual 16GB memory expansion?
The Virtual Memory Expansion can be activated in Settings and adds up to 16GB of RAM. Some software may not be compatible with this feature.