[gydrorway]

Ok I got this to work on an android. I no longer have an iPhone but it should work fine there too. You need to go to Claro and get a sim card for a blackberry and buy some prepaid days or a week of BB Social in the store so you know they actually set it up to work for a BB. If you have an old BB or a friend with one take it in and then you can verify before you leave. I just went to several different shops until I found one that would do it for me without physically having a BB with me. The only caveat is that the data speed seems to be capped at .27Mbps. The first two days it was unlimited (3-5Mbps!) then it dropped and has remained throttled ever since. I'm still trying to find a way around that.

I am in Sosua right now and can confirm that this post by tjsadler works. I brought an old Blackberry Storm 2 with a cracked screen with me, and took it to the local Claro store to buy a SIM and have them activate it. It was a bit of an ordeal that killed the better part of an afternoon, but I finally got it done. Both the language barrier and the Claro employees unfamiliarity with the plans and how they work slowed things down. I went to the Music Store first, and the guy flat out told me that it was impossible to buy a prepaid data plan for a Blackberry. So then I went to an actual Claro store, and the girl there said she could fix me up with a Blackberry Social Plan. She said it would cost RD$ 175 for 7 days plus RD$ 150 for the SIM card. So she set me up, but by the time I got back to my room at the Terra Linda, I realized that the plan she had set me up with was very limited and did not accomplish what I wanted. It only gave me access to things like Facebook and a few other social networking sites, but there was no general internet access. I couldn't access things like GoogleMaps and couldn't even access my Gmail. I know there are some previous posts saying that the Blackberry Social Plan will have full Internet access when you transfer the SIM card to a different cell phone but, due to all the conflicting messages, I didn't want to take a chance. I knew that I had to cut the SIM card in order for it to fit into my iPhone 4s, and I didn't want to risk finding out that it doesn't work after cutting the card. So I went back to the Claro store to request that they upgrade my plan from Social to Full. The girl said she didn't know how to do it and told me to come back later when someone else was there. So I returned a couple hours later, and the guy upgraded my SIM card to the Blackberry Full plan. Since the Claro website states a price of RD$ 25 for the Social Plan and RD$ 50 for the Full Plan, I figured that the upgrade would cost me additional RD$ 175 for 7 days. But the guy insisted that the upgrade was RD$ 350. I tried to tell him that made no sense and he obviously wasn't giving me credit for the RD$ 175 that I had already paid for the Social Plan. But he insisted he was and, due to my poor Spanish and his even poorer English, I finally realized that it simply wasn't worth arguing about for such a relatively small amount of money. So I paid him the extra RD$ 350 and left.

After verifying that my Blackberry now had full Internet access, I went back to my room and removed the SIM card from my Blackberry. I cut it down to micro-SIM size with a pair of scissors and slipped it into my unlocked iPhone 4s while holding my breathe. I tuned on the iPhone and viola - it worked like a charm. I know have full 3G Internet access on my iPhone for everything. And so farthe speed is great. I'm consistently getting download speeds in excess of 3 Mbps and upload speeds in excess of 1 Mbps. Hopefully that will continue.

I probably made this more difficult and more expensive than it needs to be, but I just wanted to let everyone know that it does work. A SIM card set up for a Blackberry works fine in an iPhone. You just need to cut the card down to size but, with reasonable care, it's no big deal.