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I asked Olle about the Cell Shell,
this is his response:
The 'leakage' is enough to keep it in contact with the base station. A reduction of e.g. 90% still leaves 10% untouched for communication
The company has done tests on range with WiFi with and without the shell, and it continued to work without any noticeable difference (cf. below).
I definitely was as skeptical as you are, and therefore forced the company behind this shell to make independent measurements at two well-known laboratories** (see below) for the 2G and 4G band. The shells have been shown to block up to 95% of the radiation (for SAR measurements), and up to 99% for power density measurements without significantly impairing battery capacity* or connectivity. [*I do not have first-hand data regarding the battery capacity or connectivity tests myself yet, but plan to also make independent controlled tests around this specific issue. So all the data about the battery life is so far from the company itself as well as from the measuring laboratories (cf. below). The loss is in the order of 5-7%, so not much to talk about, and - oddly enough - for all iPhone models the battery life is increased around 1-2% with the shell in place. (However, all the variations are within the limitations of the actually performed tests, so they may not be statistically significant.) Had there been a major change in the output power, due to inferior connectivity because of the shielding, I suppose we would have seen it in the battery run-time, or?] **The measurements of the shielding capacity of the shell have been done completely independently by Danish (EKTOS A/S, Copenhagen, Denmark) and Finnish (Verkotan OY, Oulu, Finland) laboratories, with myself as an independent observer.
In addition, RP of Sweden has conducted IRL-tests using telephones connected via the Swedish operators Telia, Telenor, and 3, each of which having a very good coverage and connectivity. Among very many tests, a car trip was made from Sundsvall, Sweden, down to Bremen, Germany, with two full-charged new mobile phones, one with a shell, one without, connected to the same operator. Result: no difference in battery life or coverage. Another example is a Mariehamn, Åland, trip (without problems); almost all the way to Turku, Finland (without problems); from Norrköping, Sweden, to Copenhagen, Denmark, and back (without problems); from Norrköping, Sweden, to Denmark via Gothenburg, Sweden (without problems); many trips around Småland, Sweden (without problems); etc. Since these practical examples can not be fully standardized, the company has also connected phones over the Internet and streamed "The Longest Movie on YouTube" that continues until the phone's battery runs out (results without shell: 8 hours 6 minutes, iPhone 8, brand new phone fully charged; results with shell: 8 hours 26 minutes; the phones are carefully checked at 20% remaining battery life, and 10% and 0% respectively. (As far as I know, these tests have been repeated several times with highly similar results.)
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