Hello, @sauna12! There are two leading network service providers – Globe and Smart. Both are good and offer special promotions for travelers. The SIM cards are cheap, ranging from ₱20 - ₱40 (but may vary depending on several factors). Normally if you buy SIM cards from the airports the network staff could already assist you setting it up. You could choose either Prepaid or Postpaid plans.
Prepaid Plans:
Globe: www.globe.com.ph/allnet
Smart: www.smart.com.ph/Prepaid/packages/type/all
Postpaid Plans:
Globe: www.globe.com.ph/postpaid
Smart: www.smart.com.ph/Postpaid/plans
They also offer free traveler SIM Cards:
Globe: www.globe.com.ph/international/traveling-in-the-philippines/traveler-sim
Smart: No offer as of the moment
Other networks are TM (a subsidiary of Globe) and Sun Cellular which offers cheaper promos. You could check them out. The speed of connection is location dependent, so expect a weakening of signals in some areas especially in the Visayas region. As far as I know the usual cost of an international long-distance call is $0.40 per minute and local calls range from ₱6.50 per minute and above for prepaid calls. Let me know what else I could help. Cheers!