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HTC U Ultra Manual & Quick Start Guide
View online, download, and search the official HTC U Ultra manual & quick start guide. PDF · English.
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User Manual
PDF · 3.2 MB
Quick Start Guide
PDF · 1.3 MB
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Check in settings under network. there should be some information about sim cards there, after you have a second active sim in your phone, when you call or text it will ask you which sim card/phone number you want to use.