Most will need a SIM card ... the all connect to a base server one way or the other ... when you buy, you are normally using the server of the company ... so be careful when buying China models ... make sure they are legit ...
Useful for broadcast messaging ... when you need users to be aware of situation updates ... like in security ... catering ... factory ... outdoor activities ...
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October 30th, 2024 01:05 PM #7Last edited by Walter; October 30th, 2024 at 01:07 PM.
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