This is the Smarty community forum, we are fellow customers, we don’t work for Smarty.
It looks like your phone is network locked to a network other than Smarty, hence the “emergency calls only”
How old is the phone ? Phones in the UK haven’t been network locked for a good few years.
Or, it may be that you have no coverage on Three, Smarty’s parent network, where you are. Did you check this before joining Smarty ?
Do you have, or can you quickly use someone else’s phone for 5 minutes, putting your SIM card in that, to see what happens ? If your SIM connects to Smarty in another phone, then that would indicate that your phone is indeed network locked. If you know the phone was originally used successfully on another network, be it O2, EE, Vodafone, if you can, try a SIM card from the phone’s original network. If it works, that’s another indication that your phone is network locked to a network other than Three / Smarty.