No data

[#1]

I bought a sim only deal and inserted sim to my phone. Texts and calls are fine but it seems data is not working now.

[#2]

Sorry to hear this, hohoyaa. Don't panic, though: the fix should be relatively easy

You'll need to perform a 'network settings reset' on your handset. You will be able to find instructions online by typing 'network settings reset' followed by the make and model of your handset into a search engine, but if you'd like me to guide you through it please let me know which handset you have.