does gsm phone frequency affects wifi network?

i use a wifi on my pos in a cafe, im worried that mobile phones might interfere my pos network(wi-fi).

Answers:

1No worries. GSM (depending on where you are and what network) is around 900 MHz, 1800 MHz, 1900 MHz or 850 MHz. Wi-Fi is around 2400 MHz. You are more likely to get interference from your microwave oven than a mobile phone.

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