Contributor
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2 Messages
No voice on Mobile phone when regional electricity is turned off
I have access to SONY Xperia Z1, Z3, Z5 dual premium and XZ premium, all with AT&T SIM cards. When ever the electric company goes on maintenance and shuts of the main power in my region:
Z1 looses antenna.
Z3, Z5 and XZ have antenna and LTE with full data; but no voice.
Which frequencies are missing?
My neighbor has an iPhone 7 with AT&T SIM card and voice and data is operational.
Thank you.
Accepted Solution
Official Solution
GLIMMERMAN76
ACE - Expert
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23.9K Messages
5 years ago
@Kadkhoda
my post was from 2015 lots have changed since that time
You need to get a phone that will do VoLTE and none of those sony phones will do that. If you want a cellular connection that works its time to get a branded ATT phone, iPhone or pixel 3 or 3a series phone as they all support VoLTE.
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ATTHelp
Community Support
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231.7K Messages
5 years ago
Hello @Kadkhoda,
We can definitely answer that question for you. To work on our network, your device has to operate on one of these GSM frequencies:
If you're not sure which network frequencies your device supports, you'll need to check your device manufacturer’s website.
Please let us know if you have any further questions or concerns.
Sean, AT&T Community Specialist
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Kadkhoda
Contributor
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2 Messages
5 years ago
From the posting on web page
https://forums.att.com/t5/Network-Coverage/What-is-AT-amp-T-s-GSM-HSDPA-LTE-bands/m-p/4228054
Re: What is AT&T's GSM, HSDPA, LTE bands?
GLIMMERMAN76 ACE - Expert
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ATTHelp
Community Support
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231.7K Messages
5 years ago
Thank you for that information, @Kadkhoda.
When the power is out towers switch to back up battery/generator power. However, this is the only information that we can provide regarding tower frequencies. Let us know if you have any additional questions.
Makaela, AT&T Community Specialist.
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