Weak Phone Signal

[meltau]

I recently bought a Samsung S5 but am very dissappointed.
The phone signal weakens to one bar or no signal at all when I change the network mode to either LTE/WCDMA/GSM or WCDMA/GSM. It remains steady and good only when i keep the Network Mode to GSM only. This is very frustrating...please help.

I am attaching a screen shot of the same...

 

[bbmjack]

I recently bought a Samsung S5 but am very dissappointed.
The phone signal weakens to one bar or no signal at all when I change the network mode to either LTE/WCDMA/GSM or WCDMA/GSM. It remains steady and good only when i keep the Network Mode to GSM only. This is very frustrating...please help.

I am attaching a screen shot of the same...View attachment 135949

Can you tell me your carrier and your model so we can help you more

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