Appalling 4G signal strength. Disappointing!

You didn’t “buy blind” did you ? 

Since I have been with Smarty in June, I have quite frankly been amazed at the number of people who obtain a Smarty SIM purely on price, without checking the coverage of Three, Smarty’s parent network, where they live, work and socialise. 

You absolutely have to check the coverage on whatever network you plan to use before parting with your hard earned cash. Where I live for example, O2 is extremely poor, so I won’t use O2 or any MVNO’s that use O2, such as Tesco Mobile.

Before I switched to Smarty, it was imperative that I check the coverage of Three where I mostly use my phone, to ensure that it gave me the coverage I require.