You need to configure your internet settings for data to work.
https://community.48.ie/t5/Other-Help/Internet-not-working-on-HUAWEI-ASCEND-g6-u10/m-p/34493#M12560Some phones misidentify "virtual" networks such as 48, Tesco, Lyca, GoMo etc.
But if calls, texts and data are working ok the just ignore it as it's just a display/cosmetic issue and doesn't affect functionality or cost.
Hope this helps.