Did Norwegian schools actually ban cell phones?

Some commentators are suggesting no real ban was in effect.  I went back to the Sara Abrahamsson paper to confirm the following:

Schools where students are required to hand in their phones in the morning, and therefore cannot access them during breaks, are considered to have a strict policy against smartphones. Schools where students are allowed to access their phones during breaks but are required to have them on for instance silent [mode] during lectures are classified as having a lenient policy toward smartphones. For mental health, the effect between schools with a more lenient and strict policy is relatively similar, as shown in Figure 10.17. Four years post-ban, girls experience 3.48 and 2.3 fewer visits for specialist care related to psychological symptoms and diseases at schools with a lenient and strict policy respectively (p-values 0.036 and 0.068).18 For bullying, there is not much difference dependent on the type of policy implemented when it comes to bullying, neither for girls as documented in Figure 11, or boys as shown in Appendix Figure A21.

However, girls attending a middle school introducing a strict policy against smartphones, experience an increase by 0.12 standard deviations in GPA. This estimate is significant four years post-ban at the 5% level (p-value 0.032). Additionally, girls attending a middle school with a strict policy have significantly higher teacher-awarded test scores by 0.08 and 0.14 standard deviations, three and four years post-ban (p-values 0.075 and 0.011). These results, shown in Panel A and B in Figure 12, show that both GPA and average grades set by teachers for girls improve after strict smartphone bans in schools are implemented.

…However, there are no detectable differences in the likelihood of attending an academic high school track between schools with strict compared to more lenient policies

In other words, there were strict bans and they had only modest effects, including relative to the less strict bans.  On p.34, Figure 2, you will see that 200 schools had strict bans, somewhat less than half the total (not every case is easy to classify).  Note also that if smart phone bans could help with mental health problems in a big way, we still should see a change in mental health diagnoses, following the bans, yet we do not.

Here is my original post on the topic.