Is my phone broken or my SIM?

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http://androidforums.com – Been having trouble with my HTC Incredible S recently. Texts rarely send, and I rarely receive texts, unless I turn off all data, and constantly reboot my phone and/or send texts to myself to kick starts texts into sending and receiving. I'd buy a new phone, but am waiting for the Nexus 4 to come back into stock. Calls also would rarely connect. I got sick of it today, and switched back to my old Galaxy Ace. Everything started fine, texts and calls were working brilliantly. Then I noticed I stopped getting replies, so I grabbed my dads phone and text myself off there. No texts. I text him, he (General)