Giffgaff is under O2 with an exceptional signal and offers. That ref link will give you: £5 Payback for both, £5 credit for your friend if you refer someone in the future.  Giffgaffers can call and text each other for free. Enjoy great value flexible plans. 10 pounds for free calls, texts and 20GB of data. Payback that you can withdraw in Paypal if you post/answer in the giffgaff forum. Personally, I have made over 120 pounds a year doing that. In other words, my mobile bills is 0 and on top I make a profit.

Monese is a mobile banking app similar to revolut which is currently offering up to £10 free. You get £5 upon activation and first purchase on your new card, then an additional £5 once you’ve spent a total of £500. To complete the offer : 1. Download the app: Download the app here:  2. Sign up using this invite code: APOST018 3. Verify your ID 4. Start the essential/classic plan and order your card. You can then downgrade immediately so you are not charged by going to 'My Plan'. 5. Transfer £1 into your Monese account and make a transaction (this can be done before receiving your card), online transactions are valid. 6. Wait for your card to arrive (this is usually very fast) and once it does, activate it, and you will be credited £5 with can be withdrawn instantly. I had my card and subsequent bonus within a week! 7. Done! I definitely suggest looking at my referrals as I have plenty.  

Refer a Friend and get £10 credit when they spend £45. Your friend will get £10 off & FREE UK delivery

Sign up using my link and we both get a 50 pound credit. It is also the cheapest electricity and gas provider