After I Inserted A 4G Card Into My Phone, Enabled Data Service, And Took My Phone From An Area With No Signal To - Huawei Y635-L01 Faqs

HUAWEI Y635-LXX Smartphone FAQs
3.35 After I inserted a 4G card into my phone, enabled
data service, and took my phone from an area with no
signal to an area with strong signal, my phone's network
connection falls from 4G to 3G and I can't make phone
calls. What can I do?
Update your phone to the latest version. This is a compatibility issue on the Qualcomm 8916
platform of the Qualcomm software baseline.
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