Welcome to The Answerbank.
Posts such as this one sometimes come from spammers, where another new member quickly responds with a link to a cheap SIM card provider in, say, India or the USA. (If such a post appears, I'll quickly don my moderator's hat and remove the thread). Assuming for the moment though that this is a genuine query from someone in the UK (where this website is based), check out the following providers to see which might be best for your needs in terms of calls, texts and data:
Asda Mobile is very popular with members of this site. (It's what I use myself and I'm happy to recommend to you):
https://mobile.asda.com/bundles
GiffGaff also has plenty of fans on this site:
https://www.giffgaff.com/sim-only-deals
Light users here, in particular, seem to favour 1p Mobile:
https://www.1pmobile.com/