Do you think paying for items via mobile phone will become a trend in the Arab world or is there lack of trust for e-payments and technology?

It is not only lack of trust, it will be how we do it, some people find E-Payment process very strange and difficult to follow.

Yes; Technology is moving fast in every corner and going paperless plus increased efficiency will make mobile payment possible. Currently, there is enough mobile security in e-payments which increases trust. 

I hope not. Contactless is currently becoming very popular with the youth of UK, especially on a drunken night out. Us older and wiser ones, still prefer hard cash, or using an ATM. We can keep track of our spending that way. Contactless, means one could very quickly go in the red. Albeit most Arab World Nations are Tea total, so not so susceptible to unwittingly splashing out money whilst drunk. However, there are so many scams out there, and the Mid-East is full of them.

The "Trend" is defined by a large number of people currently practing the action, and in the Arab world we can see that the online paymnet gatways, pioneered by Souq.com's "Payfort", online payment gateway, are attracting a large number of people in the Arab world and are fortifying their stand as a reputable payment system.

Their will always be risks attributed to any sort of online channel which is less certain in certain channels over others, but risk can only be minimized as much as possible, but always present as a factor.

I think paying for items via mobile phone will become a trend in the Arab world as security methods became more stronger 

Paying via phone is more easy , convenient and safe.