Samsung's 5th-generation Android-based Galaxy smartphone was released April 11, 2014. Improvements to the phone include a fingerprint scanner, updated camera, larger display, and water resistance. It is available in four different colors; black, blue, white, and copper.

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Verizon phone withT-Mobile SIM card, mic cuts out?

This is less of a "how to fix this" question and more of a "has anyone heard of this" question.

A customer showed up with a Galaxy S5 that works perfectly in all regards (never been dropped, etc), except that occasionally the microphone will cut out during a phone call. She claims to have taken it to several places, including the Verizon and T-Mobile stores, and she is consistently being told that it is because she's using a Verizon phone on a T-Mobile network. She sent the phone back to Samsung and they sent it back with a new microphone, but also told her the old microphone didn't fail their testing.

I've never heard of such a specific issue is this, and I fail to understand how a carrier choice could affect the local hardware. Has anyone heard of this?

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Verizon and T-Mobile frequencies for LTE are quite different. See below of the different specifications of the Galaxy S5 purchased from Verizon vs T-Mobile. Note the LTE bands of the Verizon vs T-Mobile. Another major difference is that T-Mobile supports Wi-Fi calling, but the Verizon one will not be able to use it since it is for T-Mobile phones only.

Verizon

Frequencies and Data Type

LTE: Bands 4/13; CDMA 1x/EVDO Rev.A: 800/1900MHz; GSM: 850/900/1800/1900MHz; HSPA+/UMTS: 850/900/1900/2100MHz

Primarily used band: 13

T-Mobile

Frequencies and Data Type

LTE: Bands 1/2/3/5/7/8/4/17 HSPA+/UMTS: 850/AWS/1900/2100MHz GSM: 850/900/1800/1900MHz

Primarily used band(s): 4, 12

It is highly possible the area T-Mobile being used in is lacking in Band 4. If the prior phone was a T-Mobile native phone, it likely had Wi-Fi calling, which further improved voice quality.

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