Can I buy a SIM card to activate my iphone without paying for a plan?

Can I buy a SIM card to activate my iphone without paying for a plan? - 1

You've to buy a prepaid SIM like from metroPCS or StraightTalk or Cricket and have it activated first. Then you can activate your iPhone coz you need to have an activated number to activate your iPhone.

Yes, new companies offer you Sim for free but that happens in prepaid only and they give you some balance and if you need some advanced security, Leo Privacy Guard would be the best.