@balangaman Hi, can you please check the troubleshooting suggestions we provided here, then get back with the results? We will suggest further: https://community.tp-link.com/en/home/forum/topic/261882

@Sukhchain Can you explain more about the sms issue you are encountering? Do you mean you cannot receive or cannot view the messages? Can we have some screenshots about it? You may try to hard reset...

@marziniconsult Can we have a screenshot of the Internet Status page when you insert the SIM card into the router correctly? If the SIM card is not detected, please try to reset the MR100 to factory...

@ale161204 I am translating your message by using google translator, and I am trying to respond. I am sorry in case of any translation errors. May I have the region version of the MR600, is it an EU...

@Vikaspandeyhere Is this Vi sim card inserted into a modem? What is the model of it? Do you have internet access when you plug this modem into the computer directly? Please refer to this article to...

@zule123 Thank you for posting on the TP-Link Community. May I know which firmware are you on now with the MR100? Who is your SIM card carrier, please? When the internet stops on the MR100, and you...