My Myphone B88 TV duo says that ny sim card is invalid

[rynjoseph.cabrera]

my sim card case is a long time ago I'm not using it, maybe it's broken

 

[webworkings]

You need to contact the carrier/service provider about that. The SIM will only work if you have service with them and if you have the correct SIM. If you have service, then they can get you a new SIM if needed.