As of 13 August 2026, AI can only partly choose the best SIM-only deal.

What to actually do

1. Hand it to a person

   The route this page recommends

   A person who owns the outcome does this end to end, worth it when the failure is dear.

2. Use a tool built for this

   Second choice

3. Do it yourself

   The distant third

   A chat interface, no skill needed, and roughly 30 minutes until you can act on the result.

   How to actually do it

   1. Write down your monthly budget, usual data use, call and text needs, preferred contract length, roaming needs and whether you need to keep your number.
   2. Check the current coverage for the networks used by the deals in the places where you regularly use your phone, including indoors where possible.
   3. Open the provider pages for the deals you are considering and copy the current price, data allowance, contract length, roaming terms, annual price changes, cancellation terms and eligibility conditions.
   4. Paste your requirements and the copied deal details into a chatbot using the prompt above, keeping out your full address, account numbers and other unnecessary personal information.
   5. Ask the chatbot to produce its comparison table and shortlist, then remove any option whose facts it cannot support from the provider information you supplied.
   6. Compare the shortlist against the provider pages and coverage checker, including the total contractual cost, price-change wording and any fair-use or roaming limits, before ordering.
   7. Read the final checkout summary yourself and save the deal name, price, terms and order confirmation.

   Prompt

   Help me choose a SIM-only deal in the UK. Use only the current deal information I paste below or information from provider pages that I explicitly provide. Do not invent prices, coverage, speeds, allowances, contract terms or cancellation rights. If information is missing or may have changed, say so and tell me exactly what to check.
   
   My requirements:
   - Monthly budget: [amount or flexible]
   - Typical monthly data use: [amount or light, medium or heavy]
   - Calls and texts: [requirements]
   - Preferred contract length: [monthly, fixed term or either]
   - Need to keep my number: [yes or no]
   - Main locations where I use the phone: [towns, areas or postcode districts, not a full address]
   - Important needs: [for example roaming, 5G, hotspot use, eSIM or international calls]
   - Current provider and reason for switching: [details]
   
   Candidate deals and source text or links:
   [Paste each deal, including the provider, network, monthly price, upfront cost, contract length, data, calls, texts, roaming terms, annual price changes, cancellation terms and any eligibility conditions.]
   
   Create a comparison table. Exclude any deal that fails a stated requirement. Rank the remaining deals by fit, not by headline price. Separate confirmed facts from assumptions, identify every missing or uncertain detail, and explain the main trade-off for each option. Do not call one deal the best unless the supplied evidence supports that conclusion. Finish with a short checklist of the provider pages and coverage information I must verify before ordering.

   Open it prefilled in ChatGPT or Claude, or copy it into Gemini, which takes no prefill link.