Huawei CHM-U01 - Page 9

HUAWEI CHM/CHC Smartphone FAQs
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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? .................................................................................................................................................................................... 78