Connection problems after sim activation

[Vr23]

I have a new I phone I have changed my network provider to sky mobile after the sim activation I can't access some apps which have been transferred, but when trying to access them I am getting messages like , no internet connection, or no network connection.

my internet is working on other devices , and I can get the internet on web browsers on my phone, I also think I don't have a strong phone signal.

Really think I need to speak to someone who can resolve this , because I am unsure what to do  ?

[caesarome]

@Vr23 

As this is an iphone try refreshing the network settings so go Settings > General > Transfer or Reset [Device] > Reset > Reset Network Settings. Then go to Settings - Phone - My Number and change it if it is wrong, then reboot the phone. You will need to set up your Wifi connection again.

[Vr23]

Thanks 

Unfortunately the advice has not resolved the situation